Sponge rock #3 is a great ingredient for do it yourself orchid potting mixes for seedling and miniature orchids. It adds light weight bulk as well as
OrchidWeb offers a wide selection of quality orchid species, hybrids and supplies with special care in our shipping.
Perlite, Super Coarse by Grow! It (aka sponge rock) #4 and #8
Large Sponge Rock perlite Orchids
Better-Gro Orchid 8-Quart Fruit; Flower and Vegetable Organic Potting Soil Mix in the Soil department at
How to Use Perlite to Improve Soil and Boost Plant Growth – Garden Betty
I need a coarse, chunky perlite because all i get is dust every time I try a new kind. What brands do you guys use so I can be sure I won't
Coarse Sponge Rock (perlite) – QuarterAcreOrchids
Large Sponge Rock (#4) – Ravenvision Orchid Supplies
Large Sponge Rock A-La-Carte Bag - 2.5 gallons (10 quarts) in a resealable Bag : Soil And Soil Amendments : Patio, Lawn & Garden
Perlite vs. Vermiculite: How and Why to Use Them – Garden Betty
