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Home > Supplies and Equipment > Potting Media > Growstone (perlite/sponge rock alternative)

Growstone (perlite/sponge rock alternative)

Growstone (perlite/sponge rock alternative)<span class="cross"></span>
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Base Price



1.5 cu ft (GS-1 Hydroponic/chunky) ($45.00)
1.5 cu ft (GS-2 Soil Aerator/small grade) ($45.00)
9 liter bag (GS-2 Soil Aerator/small grade) ($24.00)
9 liter bag (GS-1 Hydroponic/chunky) ($24.00)


A product that can be used as a substitute for perlite or sponge rock. Growstone has 40% more porosity than perlite, and is made from recycled glass which is 100% silica. It is a great product to mix with high moisture retentive materials such as coir and peat moss.


The GS-2 Soil Aerator size, which is the most commonly used size in orchid potting applications, has granules that are 1/4" to 1/2" in size. The GS-1 Hydrostones (hydroponic/chunky) are 1/2" to 3/4" in size.


The smaller bag size is 4 lbs and roughly 9 liters (8.2 quarts) of material.


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An orchid plant may arrive in bud, in bloom or in various stages of in-spike development. A plant in-spike can take anywhere from 1 week to 2 months before flowers begin to open. We are one of the few nurseries to ship orchids in spike or bloom. Most of the time our carefully wrapped orchids in-spike or in-bloom arrive in good condition. However, due to conditions beyond our control, we cannot guarantee that all flower spikes, flowers, or buds will arrive in perfect condition.

An orchid will arrive while it is not currently spiking or blooming due to being either before or after its bloom season. Check the "Bloom Season" information on the product page to see when the plant is expected to spike and flower. Many orchid lovers and hobbyists prefer plants that are not in-spike in order to watch the first stages of the spike emerging all the way through to the reward of the bloom! If you are sending a plant as a gift, you generally want to send the plant in-spike unless the gift receiver would prefer otherwise.