I've looked in nurseries, Home Depot, and Lowes and could not find any horticultural pumice. If you have ever found pumice, let me know where!
On the other hand, my mom brought some pumice scrubber things home from the grocery store to see if they are the right stuff. I crushed them up and they seem legitimate. The only thing I'm worried about with these is that they might have chemicals in them of some sort...
lol, no. It just says "made in china" like everything else these days. That's what makes me a little more worried... perhaps I should just try it out and see if it kills the plants. One pot without pumice, and one with it.
I really think that you can use other materials that will do the same thing, some people use ingredients because they can get them everywhere or for really cheap. I pot 90% of my orchids is pure LFS every year because I can get it really inexpensive, as where other people will go with a different mix because LFS is expensive where they live.
Have you looks for places that sell stuff like sponge rock?
Good day everyone - Sorry to dredge up such an old thread but I have been searching for horticultural pumice ever since I moved away from the western States. There you could get it cheap, and it is so much better than perlite (because it doesn't break down over time and it holds more water while draining better). Plus, the intense white of perlite I find to be visually distracting in a soil mix.
Recently my quest ended when I found a new product "Growstone"; it is man-made pumice! Pumice is just volcanic glass foam, and this stuff is made of recycled glass. They make it on the Albuquerque landfill using the methane from the landfill to fire the kilns. You really can't get more environmental than that.
The stuff feels just like pumice, and is a reddish brown color making it look nice in a soil mix too. Okay, so I don't know if it is yet available in Canada, but you can apparently get it in all 50 states, which already makes it more acquirable than pumice.
Anyhow, if you are looking for pumice it might be worth checking for this in Canada too. They make a large chunk version for hydroponics, and so stores catering to that hobby are good places to check.
I know this was a pretty glowing review, but I assure you I have no association with the company. I am just excited to have an environmentally responsible version of my pumice back to use for growing plants.
Last Edit: Dec 2, 2012 11:36:26 GMT -5 by Apoplast
Hi Drew - Awesome, thanks for posting a link for Canada! I'm glad it's available in Canada too (it would have been a little silly for me to have posted something here about a product that was entirely unavailable in Canada). There seem to be two sizes that are commonly available, a large size for hydroponics - which is probably totally unsuitable for all but the largest CP's, and a smaller size which is slightly larger than the horticultural pumice I used to get - but the smaller size is a pretty good pumice substitute.
All I could find on their website was the larger chunk stuff (link in my previous post) but I bet they have the smaller stuff as well, and if not could order it. The company selling it appears to have a location in Mississauga, ON and Langley, BC.
Good day everyone - Sorry to dredge up such an old thread but I have been searching for horticultural pumice ...
It'll cost about $CDN130 to get an 80lb bag from a Hess distributor in New England. I reckon I will order some in early summer after I get the veggies in the ground - and I free up some space. If anyone else (orchid geeks?) is interested PM me - Apoplast, this guy is in the US. Contact Hess and they can give you someone close to you. Hess are in Idaho.
lloyd: Snow or rain collected directly into a bucket in Toronto is 0 PPM TDS. From a roof, check the TDS. If < 25 good for CP's, 25->50 Ok for bogs or big outside pots.
Jun 22, 2015 18:17:41 GMT -5
lloyd: pH of water with very low TDS doesn't mean much so I wouldn't bother checking.
Jun 22, 2015 18:19:20 GMT -5
lloyd: Aluminum will contaminate water so you should know what your roof is made of. A TDS meter will not check for aluminum. I have an aluminum test kit which showed my dehumidifier water had toxic levels of aluminum.
Jun 22, 2015 18:21:06 GMT -5
Dennis A(cook1973): why do people look for better ways to get water or a CP? for under 2 dollars I can get 1 liter of aqua-fina RO water....0ppm or for a little more I can get 4 liters of distilled water...0ppm too!
Jun 23, 2015 8:42:46 GMT -5
lloyd: 99¢ for 4 liters distilled H2O @_Costco.
Jun 23, 2015 14:08:37 GMT -5
peatmoss: I used to get mine for about a buck a gallon at a fill your own distillery. Worked pretty well, but the drive was a bit much, so I switched to just buying it at the store. Now I run a combination of water I buy at the grocery store and rainwater.
Jun 23, 2015 16:00:41 GMT -5
peatmoss: The only problem with my rain barrel are the mosquito larvae that run out the tap everytime I go to get water. Fishing them out is a bit of a chore...
Jun 23, 2015 16:01:22 GMT -5
hal: My rain barrel has a screen over the water inlet so 'squitos don't get in.
Jun 23, 2015 16:14:39 GMT -5
lloyd: Just use a dollar store colander to sieve out the mosquito larvae, then you can feed them to your plants-kill them first (the larvae, not your plants) or you will have mosquitoes flying around your house.
Jun 23, 2015 21:54:26 GMT -5
peatmoss: Ours used to have one of those. It must've rusted out, or it has enough big holes in it for the skeeters to get through. Should probably fix that...
Jun 23, 2015 21:54:43 GMT -5
peatmoss: Colander is a good idea, so is free plant food. I'd bet you could feed them to fish, too.
Jun 23, 2015 21:56:25 GMT -5
amanitovirosa: ...I filter my collected rainwater, seems to be working...
Jun 23, 2015 21:57:57 GMT -5
willyckh: My plants arrived!!! Thanks Cole
Jun 25, 2015 12:04:14 GMT -5
bonfield: You're welcome
Jun 25, 2015 14:37:28 GMT -5
Dennis A(cook1973): @ Peatmoss....I have a bottle of Bloodworms with just 1 ingredient....Freeze dried mosquito larvae!!
Jun 28, 2015 16:59:55 GMT -5
willyckh: I have some small aquatic snails, should I put them in my water trays to eat the algae? I'm tired of changing the green water every few days.
Jun 29, 2015 17:35:54 GMT -5
lloyd: Throw in the U. gibba.
Jun 30, 2015 8:22:41 GMT -5
willyckh: Alrighty then
Jun 30, 2015 9:24:12 GMT -5
peatmoss: Lloyd is right, the trays where I grow my U. gibba are usually algae free. I guess it grows fast enough to outcompete the green slime for nutrients.
Jun 30, 2015 13:29:03 GMT -5
willyckh: Nice! Guess I will have to divide my U. Gibba and put them in all the trays.
Jun 30, 2015 14:36:40 GMT -5