Pumice versus Perlite - Q & A - Harmony in the Garden (2024)

I would very much like to win a bag. Am looking for something that is much better for my plants & the environment. Would love to use this product. Have used many products for several years. This has to be better.

Dear friends. It is nice to find you on Facebook. I have been involved in the bonsai world for many years. The subject of soil and soil mixes has always been a subject of intense interest. Many products have come in and out of favor. In recent years, thanks to writings of several young “masters” pumice has moved at or near the top of popularity. Many still favor Japanese materials such as akadama.. Many advocate mixes including granite grit, crashed lava, etc. I am just recovering from a heart attack and it is the dormant season here in New England but I look forward to trying your materials in the future. I wish you success in your endeavors. Happy new year.

Yes I would love to try pumice,it would be wonderful to help promote your business and get the word out. I would love to win this. Thank you for the opportunity and Merry Christmas and Happy New Year.

I have never used pumice before but really looking forward to use it for my adeniums, aeoniums and succulents. I was reading about pumice a lot recently and it looks interesting product.

Wow! I love learning about new, naturally occurring things! Can’t wait to try some pumice in my garden. I have a once a week watering schedule and this would be perfect to help air out some of my plants that stay a little moist!

What a great article! I’m so excited to use Pumice in my mini succulent plants at http://www.lovelylittleplants.com. As most of these plants quickly go home with a new owner, I always worry that they will be overwatered and end up dying. Pumice would help prevent root rot and extend the life of these Lovely Little Plants!

Okay, I’m quite intrigued by this product. In the UK, they are always using “horticultural grit,” but I’ve never been able to find anything like that here. This sounds like a potential alternative. They use it for aeration and for covering seed trays. I think I’ll have to give this a try!

Great article. I teach a class of exceptional children and we have a small aquaponics and greenhouse. We are focusing on ground cover and succulents this year – yes, ground cover and sedum are growing even in aquaponics! We would use the pumice for planting up our succulents for sale. All monies goes to the students.

Most years we get plenty of rain here in east Tennessee. Using pumice would greatly reduce “death by water” for all my succulents, agave and cactus.
Thank you for the giveaway and I enjoyed the article Lexi and Austin Petelski.

I recently purchased several bags of this pumice and am truly amazed at how much better it is from ANY other pumice I have bought on the web! It really has helped out my Haworthia collection from what I was using. Thanks.

I need it to build raised beds for my hardy [7b] cacti and succulents, and some other easily over-watered plants that need great drainage. I also plan on using it in my 4 greenhouses ………….. I hope I win !!!! Merry Christmas !!!! [p.s. ~ Facebook will NOT let me “LIKE” your page but DOES let me sign up for notifications [all] and events !!! So, I can keep track of your company !!! 🙂

What perfect timing Rebecca! I have been worried about the upcoming rains, especially around my fruit trees. I’ll have to do some research to see if pumice can help them balance out the water. But I will definitely be trying pumice with my succulents and other parts of my garden. Thanks so much for the info!

I have been planting succulants for over a year, slowly my grass is getting smaller and smaller. I cut water bill over 50%.
I have been also making hypertufa pots that are using perlite to be made, I will love to use pumice instead and see how that would work.
Thank you for creating organic products.

what an exciting adventure your dad created for his family. Thank you for bringing your pumice to the garden industry. I, too, have had little experience with pumice and look eagerly to mixing pumice into my garden soil. My succulent garden will have a Christmas treat!
Happy Holidays,
Rochelle

Great article on pumice. I worked for years for an orchid /bedding plant nursery. They used it straight for the orchids and mixed it in their soil for geraniums and bedding plants. Plants thrived’

My husband and I have finally found a hobby we both love to do together! Succulents fascinate us and we are constantly trying to expand our knowledge and preparing for our So Cal water wise front yard. I would love to use pumice in my containers and even in the mix of things in our front xeriscape / desert creation we are working on for this spring….post El Nino. 🙂 Thank you for sharing this information and for this opportunity!

I garden in Iowa zone 5 and have used and purchased perlite and chicken grit. Pumice is not a product seen in our garden shops. I am a long time Master Gardener and a greenhouse worker and always open and eager to learn and pass my knowledge on to others. I plan to do more research on this product.

I had my pool filled in and Urban Artichokes did my landscaping. I am fascinated by how I can take a cutting and a new succulent will grow. I have never heard of pumice except for foot care. I enjoyed your article and would love to win a bag for my new landscaped succulents.

Hi, I have been a pumice fan since I was three years old, now 56, living in Southern and later in Northern California. How you may ask? My dad was a pool contractor and did a lot of projects at home in soft- and hardscaping. I would help in my own childish ways and in specific chores. Pumice was always at the house. Back then, it wasn’t all screened perfectly, there were rocks of various sizes and shapes, even small boulders. Plus, he would bring materials home from job sites. FUN! I would sift through the bags and piles for specimens to keep in my collections. We would use pumice in our planting soils. I used it as litter for my guinea pigs and rabbits (I had to clean the cages!). We decorated the ground with it and used larger pieces for paths. As I grew and became a plant nut and then later additionally a succulent and cactus nut, it was part of DNA to use pumice and lava rock as an aerator and substrate and thing of beauty! I never used sand in my rose pots –PUMICE! Ferns and azaleas? PUMICE! Succies? PUMICE! The perfect culmination of aesthetics and efficacy. Yay!

I have been growing succulents by cuttings and also planting seeds. I would love a chance to win a free bag of pumice to add to my soil for healthier plants.

I have a lot of succulents and have been using “chicken grit” as an additive. I would love to try your pumice!” Thaks,

What a great article. I always wondered about pumice and have read where people are using it for potting soil. I was planning on trying it this summer. A free bag would be AWESOME!!!

You don’t have to sell me on the benefits of pumice!!! I have used it for years here in Arizona. I used perlite back East because at the time pumice was not available. Pumice is the best!

I received a large aloe dichotoma pup (30″ tall), in a not so prime planting time. I put the aloe in a 5 gallon bucket of pure pumice for 3 months. It thrived in the bucket until planted Subsequently, the aloe dichotoma was planted in the yard and it is doing well. I have mixed the pumice from the bucket with my Uni-Grow cactus mix for potting and repotting my cactus and succulents. I also use pure pumice to root succulent cuttings.

Great article, thanks for the info. I love using pumice to plant my cactus and succulents in pots or in the ground. I mix pure pumice with any cheap regular potting soil and viola, I have a wonderfully super draining medium! I also mix it into the ground soil, when planting cacti in the ground, gives me peace of mind, knowing that they will not be overwatered by nature. Like a little insurance protection!

I’d love to try this pumice since gravel and other amendments mentioned in your post have proved unreliable for drainage. Organic but never breaks down is a great point.

I am an avid gardener growing everything from vegetables and fruits to succulents and fairy gardens. I love to experiment with new things. I would love to try the pumice in my gardens and would definitely share the benefits with my friends!

I have just recently bought a 40lb bag, and am anxious to use it. My plants all need new soil made up, so I will use pumice in all my replanting. I believe after reading your article, which by the way was quite interesting, I will put some pumice in an area when it rains the water sits, this should help the succulents that are planted in this area when we get hit with large amounts of rain. I hope it will help the plants not to die because of water sitting.

Pumice Pumice Pumice!!! For my garden and indoor plants.
So excited to learn about something more to amend my garden.

I live in San Diego and we are expected to get pounded with El Nino this winter. I just had my yard zeroscaped and could really use the pumice to ensure my new succulents survive. In addition, I have been growing a spiral aloe for almost 2 years
In a pot. They typically can’t survive in this neck of the woods. As a matter of fact in the past 2 yrs since I aquired it, I have yet to find a garden shop or succulent dealer in all of San Diego that sells them, so I am EXTREMELY careful with it’s care. I think adding pumice to the soil is just the safeguard I need.

Love the information, would love to try this product. Thank you

I’d like to add it to the soil in my native plant butterfly garden, in the San Francisco Bay Area. The soil right now is over-weighted with bark etc. from old Monterey Pines that I cut down.

I would love to try it, I only tried perlite before, and I would love to make my own succulent mix.

Please sign me in ,I will use it in spring for repotting my succulents.

I learned some very important & informative information. I now realize the need for pumice instead of perlite & intend to use it. Of course, I would love to win a bag so I can take it for a test drive.

This would be great for outdoor succulents with my clay soil.

As a geologist, I am aware that pumice not only provides drainage but, unlike most other materials, also provides some ability to slowly release water(due to each grain having pores) and as it very slowly breaks down it releases trace minerals to the plants. In short, it is an ideal soil additive for succulents!

I would love to use pumice to amend my succulent soil. I live in central Florida and while temperatures allow me to grow many succulents in the ground, sufficient drainage is always a concern. I currently use mostly perilite because that is what is readily available but don’t like that it floats and would love to try making the switch to pumice.

What great information! Definitely will need to get some pumice

I am new to succulent gardening and I would like to try pumice in some of my pots, then perhaps work it into my soil also–on a trial basis.

I have been using Dry Stall for years ever since I read about it in Debra Baldwin’s books. I buy it at my local feed store. Is the General Pumice Product different?

What a great product to help my many succulents survive el Nino.

I have been in the garden over too many years. But I still crave the feel of the earth. But I have never used pumice. It is time.

It would be great to win a bag of pumice. Although I love succulents, growing them in Florida’s rainy summers can be tricky. The pumice sounds like a great product for amending the soil.

Who knew that pumice has so many uses, and that as a soil amendment it is wonderful for potted plants. I have an all pot garden that has suffered substantial in the drought and with excessive rain. I love the water-retention properties of the pumice and would replant everything that has so far managed to survive. Are there any plants that don’t need what pumice has to offer?

Oops — just realized that I need to add my last name also. Sorry about that. I certainly battle with the rain and humidity here in Florida and I will definitely be looking to add more pumice to my “mix”. I’ve been growing succulents for quite a few years and I do lose some. I thoroughly loved the article –and as far as I’m concerned — every little bit of advice and knowledge helps. It’s so frustrating (and sad) when I find another succulent that’s bitten the dust; but through wet feet.

What a great article! Pumice seems to be a great resource material for our Succulents in containers and in the ground along with other plants that need good drainage without using something not natural or breaks down to fast or floats away.

This is very informative; I live in Berkeley and with our clay soils, succulents and Leucadendrons just rot. I will be adding pumice to my pots and soil and start specifying this for landscape projects with my clients!

It sounds like a wonderful organic solution for all my succulents, and also I have wanted to plant some I my clay soils so sounds like a great solution. Free shipping sounds like an ideal way to get it to our home.

I’d love to try pumice in my succulent containers and to augment the soil in the new succulent bed I started this year.

Is this product available in Canada?

I have a blood orange tree that needs to be re potted this spring. I had trouble keeping it watered properly this year (and did not want to add those plastic gels to the soil) so I am looking forward to using this porduct here and on all my potted plants and leucadenrons. Thanks for the informative article!

i have a garden full of succulents, proteas, palms and… wood chips. can i sprinkle the pumice around the plants or does it have to be tilled into the soil, under the wood chips? i do as little soil intervention as possible. thanks! sara jorgensen

I would love to win and try it out in my terracing ànd other places in my garden. Sounds wonderful. I do use the other products you listed but have to replace then all the time. I really enjoyed your article and learned a lot about your pumice. Thank you.

How nice to have another option for the garden and I love that it is organic!

I’ve been so worried about all my drought tolerant plants (especially the succulents) with all this rain so I would definitely love to add some pumice to my clay soil and keep everyone from getting waterlogged this winter. How fast can the bag get here? LOL

I’d bring the bg of pumice to pot up plants with fellow Master Gardeners for our annual plant sale. It is our largest fundraiser and provides us an opportunity to share unique plants and information with our community.

My garden has been ignored for years and needs amendments desperately–water stands on it and runs off rather than percolating down. I do have some succulents and hope to redesign everything by converting to drip lines and primarily native plants. Pumice is most likely the answer to making for a wonderful garden!

We recently replaced our thirsty lawn with drought-tolerant plants. Given the expected El Nino rainstorms, I wish I’d known about pumice sooner! I would definitely like to mix some into our planting beds, if it’s not too late.

I would like to use pumice to amend the soil in my garden planters that border my backyard. My goal is to use Debra Baldwin’s recipe and then plant waterwise plants and beautiful succulents. Currently my soil is claylike and drains poorly. Thank you for the opportunity!

I’ve been using perlite, but I’m ready to try pumice. I’m in Missouri and I want to see if my succulents will be happier with your pumice

I grow succulents indoors & out & would love to try this.

What a wonderful, informative post. I had not considered pumice in my garden, but I would love to start using it in containers especially for my rosemary plants I bring indoors.

I would very much like to win a bag. Am looking for something that is much better for my plants & the environment. Would love to use this product. Have used many products for several years. This has to be better.

Dear friends. It is nice to find you on Facebook. I have been involved in the bonsai world for many years. The subject of soil and soil mixes has always been a subject of intense interest. Many products have come in and out of favor. In recent years, thanks to writings of several young “masters” pumice has moved at or near the top of popularity. Many still favor Japanese materials such as akadama.. Many advocate mixes including granite grit, crashed lava, etc. I am just recovering from a heart attack and it is the dormant season here in New England but I look forward to trying your materials in the future. I wish you success in your endeavors. Happy new year.

Yes I would love to try pumice,it would be wonderful to help promote your business and get the word out. I would love to win this. Thank you for the opportunity and Merry Christmas and Happy New Year.

I have never used pumice before but really looking forward to use it for my adeniums, aeoniums and succulents. I was reading about pumice a lot recently and it looks interesting product.

Wow! I love learning about new, naturally occurring things! Can’t wait to try some pumice in my garden. I have a once a week watering schedule and this would be perfect to help air out some of my plants that stay a little moist!

What a great article! I’m so excited to use Pumice in my mini succulent plants at http://www.lovelylittleplants.com. As most of these plants quickly go home with a new owner, I always worry that they will be overwatered and end up dying. Pumice would help prevent root rot and extend the life of these Lovely Little Plants!

Okay, I’m quite intrigued by this product. In the UK, they are always using “horticultural grit,” but I’ve never been able to find anything like that here. This sounds like a potential alternative. They use it for aeration and for covering seed trays. I think I’ll have to give this a try!

Great article. I teach a class of exceptional children and we have a small aquaponics and greenhouse. We are focusing on ground cover and succulents this year – yes, ground cover and sedum are growing even in aquaponics! We would use the pumice for planting up our succulents for sale. All monies goes to the students.

Most years we get plenty of rain here in east Tennessee. Using pumice would greatly reduce “death by water” for all my succulents, agave and cactus.
Thank you for the giveaway and I enjoyed the article Lexi and Austin Petelski.

I recently purchased several bags of this pumice and am truly amazed at how much better it is from ANY other pumice I have bought on the web! It really has helped out my Haworthia collection from what I was using. Thanks.

I need it to build raised beds for my hardy [7b] cacti and succulents, and some other easily over-watered plants that need great drainage. I also plan on using it in my 4 greenhouses ………….. I hope I win !!!! Merry Christmas !!!! [p.s. ~ Facebook will NOT let me “LIKE” your page but DOES let me sign up for notifications [all] and events !!! So, I can keep track of your company !!! 🙂

What perfect timing Rebecca! I have been worried about the upcoming rains, especially around my fruit trees. I’ll have to do some research to see if pumice can help them balance out the water. But I will definitely be trying pumice with my succulents and other parts of my garden. Thanks so much for the info!

I have been planting succulants for over a year, slowly my grass is getting smaller and smaller. I cut water bill over 50%.
I have been also making hypertufa pots that are using perlite to be made, I will love to use pumice instead and see how that would work.
Thank you for creating organic products.

what an exciting adventure your dad created for his family. Thank you for bringing your pumice to the garden industry. I, too, have had little experience with pumice and look eagerly to mixing pumice into my garden soil. My succulent garden will have a Christmas treat!
Happy Holidays,
Rochelle

Great article on pumice. I worked for years for an orchid /bedding plant nursery. They used it straight for the orchids and mixed it in their soil for geraniums and bedding plants. Plants thrived’

My husband and I have finally found a hobby we both love to do together! Succulents fascinate us and we are constantly trying to expand our knowledge and preparing for our So Cal water wise front yard. I would love to use pumice in my containers and even in the mix of things in our front xeriscape / desert creation we are working on for this spring….post El Nino. 🙂 Thank you for sharing this information and for this opportunity!

I garden in Iowa zone 5 and have used and purchased perlite and chicken grit. Pumice is not a product seen in our garden shops. I am a long time Master Gardener and a greenhouse worker and always open and eager to learn and pass my knowledge on to others. I plan to do more research on this product.

I had my pool filled in and Urban Artichokes did my landscaping. I am fascinated by how I can take a cutting and a new succulent will grow. I have never heard of pumice except for foot care. I enjoyed your article and would love to win a bag for my new landscaped succulents.

Hi, I have been a pumice fan since I was three years old, now 56, living in Southern and later in Northern California. How you may ask? My dad was a pool contractor and did a lot of projects at home in soft- and hardscaping. I would help in my own childish ways and in specific chores. Pumice was always at the house. Back then, it wasn’t all screened perfectly, there were rocks of various sizes and shapes, even small boulders. Plus, he would bring materials home from job sites. FUN! I would sift through the bags and piles for specimens to keep in my collections. We would use pumice in our planting soils. I used it as litter for my guinea pigs and rabbits (I had to clean the cages!). We decorated the ground with it and used larger pieces for paths. As I grew and became a plant nut and then later additionally a succulent and cactus nut, it was part of DNA to use pumice and lava rock as an aerator and substrate and thing of beauty! I never used sand in my rose pots –PUMICE! Ferns and azaleas? PUMICE! Succies? PUMICE! The perfect culmination of aesthetics and efficacy. Yay!

I have been growing succulents by cuttings and also planting seeds. I would love a chance to win a free bag of pumice to add to my soil for healthier plants.

I have a lot of succulents and have been using “chicken grit” as an additive. I would love to try your pumice!” Thaks,

What a great article. I always wondered about pumice and have read where people are using it for potting soil. I was planning on trying it this summer. A free bag would be AWESOME!!!

You don’t have to sell me on the benefits of pumice!!! I have used it for years here in Arizona. I used perlite back East because at the time pumice was not available. Pumice is the best!

I received a large aloe dichotoma pup (30″ tall), in a not so prime planting time. I put the aloe in a 5 gallon bucket of pure pumice for 3 months. It thrived in the bucket until planted Subsequently, the aloe dichotoma was planted in the yard and it is doing well. I have mixed the pumice from the bucket with my Uni-Grow cactus mix for potting and repotting my cactus and succulents. I also use pure pumice to root succulent cuttings.

Great article, thanks for the info. I love using pumice to plant my cactus and succulents in pots or in the ground. I mix pure pumice with any cheap regular potting soil and viola, I have a wonderfully super draining medium! I also mix it into the ground soil, when planting cacti in the ground, gives me peace of mind, knowing that they will not be overwatered by nature. Like a little insurance protection!

I’d love to try this pumice since gravel and other amendments mentioned in your post have proved unreliable for drainage. Organic but never breaks down is a great point.

I am an avid gardener growing everything from vegetables and fruits to succulents and fairy gardens. I love to experiment with new things. I would love to try the pumice in my gardens and would definitely share the benefits with my friends!

I have just recently bought a 40lb bag, and am anxious to use it. My plants all need new soil made up, so I will use pumice in all my replanting. I believe after reading your article, which by the way was quite interesting, I will put some pumice in an area when it rains the water sits, this should help the succulents that are planted in this area when we get hit with large amounts of rain. I hope it will help the plants not to die because of water sitting.

Pumice Pumice Pumice!!! For my garden and indoor plants.
So excited to learn about something more to amend my garden.

I live in San Diego and we are expected to get pounded with El Nino this winter. I just had my yard zeroscaped and could really use the pumice to ensure my new succulents survive. In addition, I have been growing a spiral aloe for almost 2 years
In a pot. They typically can’t survive in this neck of the woods. As a matter of fact in the past 2 yrs since I aquired it, I have yet to find a garden shop or succulent dealer in all of San Diego that sells them, so I am EXTREMELY careful with it’s care. I think adding pumice to the soil is just the safeguard I need.

Love the information, would love to try this product. Thank you

I’d like to add it to the soil in my native plant butterfly garden, in the San Francisco Bay Area. The soil right now is over-weighted with bark etc. from old Monterey Pines that I cut down.

I would love to try it, I only tried perlite before, and I would love to make my own succulent mix.

Please sign me in ,I will use it in spring for repotting my succulents.

I learned some very important & informative information. I now realize the need for pumice instead of perlite & intend to use it. Of course, I would love to win a bag so I can take it for a test drive.

This would be great for outdoor succulents with my clay soil.

As a geologist, I am aware that pumice not only provides drainage but, unlike most other materials, also provides some ability to slowly release water(due to each grain having pores) and as it very slowly breaks down it releases trace minerals to the plants. In short, it is an ideal soil additive for succulents!

I would love to use pumice to amend my succulent soil. I live in central Florida and while temperatures allow me to grow many succulents in the ground, sufficient drainage is always a concern. I currently use mostly perilite because that is what is readily available but don’t like that it floats and would love to try making the switch to pumice.

What great information! Definitely will need to get some pumice

I am new to succulent gardening and I would like to try pumice in some of my pots, then perhaps work it into my soil also–on a trial basis.

I have been using Dry Stall for years ever since I read about it in Debra Baldwin’s books. I buy it at my local feed store. Is the General Pumice Product different?

What a great product to help my many succulents survive el Nino.

I have been in the garden over too many years. But I still crave the feel of the earth. But I have never used pumice. It is time.

It would be great to win a bag of pumice. Although I love succulents, growing them in Florida’s rainy summers can be tricky. The pumice sounds like a great product for amending the soil.

Who knew that pumice has so many uses, and that as a soil amendment it is wonderful for potted plants. I have an all pot garden that has suffered substantial in the drought and with excessive rain. I love the water-retention properties of the pumice and would replant everything that has so far managed to survive. Are there any plants that don’t need what pumice has to offer?

Oops — just realized that I need to add my last name also. Sorry about that. I certainly battle with the rain and humidity here in Florida and I will definitely be looking to add more pumice to my “mix”. I’ve been growing succulents for quite a few years and I do lose some. I thoroughly loved the article –and as far as I’m concerned — every little bit of advice and knowledge helps. It’s so frustrating (and sad) when I find another succulent that’s bitten the dust; but through wet feet.

What a great article! Pumice seems to be a great resource material for our Succulents in containers and in the ground along with other plants that need good drainage without using something not natural or breaks down to fast or floats away.

This is very informative; I live in Berkeley and with our clay soils, succulents and Leucadendrons just rot. I will be adding pumice to my pots and soil and start specifying this for landscape projects with my clients!

It sounds like a wonderful organic solution for all my succulents, and also I have wanted to plant some I my clay soils so sounds like a great solution. Free shipping sounds like an ideal way to get it to our home.

I’d love to try pumice in my succulent containers and to augment the soil in the new succulent bed I started this year.

Is this product available in Canada?

I have a blood orange tree that needs to be re potted this spring. I had trouble keeping it watered properly this year (and did not want to add those plastic gels to the soil) so I am looking forward to using this porduct here and on all my potted plants and leucadenrons. Thanks for the informative article!

i have a garden full of succulents, proteas, palms and… wood chips. can i sprinkle the pumice around the plants or does it have to be tilled into the soil, under the wood chips? i do as little soil intervention as possible. thanks! sara jorgensen

I would love to win and try it out in my terracing ànd other places in my garden. Sounds wonderful. I do use the other products you listed but have to replace then all the time. I really enjoyed your article and learned a lot about your pumice. Thank you.

How nice to have another option for the garden and I love that it is organic!

I’ve been so worried about all my drought tolerant plants (especially the succulents) with all this rain so I would definitely love to add some pumice to my clay soil and keep everyone from getting waterlogged this winter. How fast can the bag get here? LOL

I’d bring the bg of pumice to pot up plants with fellow Master Gardeners for our annual plant sale. It is our largest fundraiser and provides us an opportunity to share unique plants and information with our community.

My garden has been ignored for years and needs amendments desperately–water stands on it and runs off rather than percolating down. I do have some succulents and hope to redesign everything by converting to drip lines and primarily native plants. Pumice is most likely the answer to making for a wonderful garden!

We recently replaced our thirsty lawn with drought-tolerant plants. Given the expected El Nino rainstorms, I wish I’d known about pumice sooner! I would definitely like to mix some into our planting beds, if it’s not too late.

I would like to use pumice to amend the soil in my garden planters that border my backyard. My goal is to use Debra Baldwin’s recipe and then plant waterwise plants and beautiful succulents. Currently my soil is claylike and drains poorly. Thank you for the opportunity!

I’ve been using perlite, but I’m ready to try pumice. I’m in Missouri and I want to see if my succulents will be happier with your pumice

I grow succulents indoors & out & would love to try this.

What a wonderful, informative post. I had not considered pumice in my garden, but I would love to start using it in containers especially for my rosemary plants I bring indoors.