Soil Amendments

The 650g Gro-Med coco coir brick is the small size of our triple-washed, low EC, OMRI Listed coir. It expands to about 10 quarts (2.5+ gallons), the right amount for one small monotub, a casing layer or a test batch, without hydrating 20 gallons at once. 650gCompressed ~10 qtExpanded Low ECTriple washed pH 5.8–6.5Neutral OMRIListed organic Why growers use Gro-Med coir Triple washed, low EC Excess salts are rinsed out, so you start from a clean base for mushroom substrate and sensitive roots....

Four Gro-Med premium 5kg coco coir bricks in one bundle. Each brick expands to more than 20 gallons, so the 4-pack gives you about 80 gallons of clean coir for CVG batches and several monotubs. It is the same brick we sell on its own, bundled at a lower cost per brick. Compressed coir stores in very little space, so you can keep a supply on the shelf and hydrate one brick at a time. 4 x 5kgBricks 80+ galExpanded total OMRIListed organic TripleWashed Low ECpH neutral Why bulk growers pick the...

The Gro-Med 5kg coco coir brick is a triple-washed, low EC, OMRI Listed block of 100% coconut coir. One compressed 10 lb brick expands to more than 20 gallons (about 80 quarts) of clean, pH-neutral substrate. It's the standard base for CVG and casing layers, and it works just as well in garden and hydroponic mixes. 5kg~10 lb compressed 20+ galExpanded ~80 qtExpanded Low ECTriple washed OMRIListed organic Why growers use Gro-Med coir Triple washed, low EC Excess salts are rinsed out, so you...

A 4 cubic foot bag of Palmetto professional-grade A-2 medium vermiculite, about 30 gallons, for growers who mix their own substrate or run many tubs. It holds water evenly for substrate hydration, casing layers and PF tek. The A-2 medium grade sits between fine and coarse, which suits mushroom work better than the coarse vermiculite sold at most big-box stores. It is asbestos-free. 4 cu ftBag size ~30 galVolume A-2Medium grade PalmettoProfessional grade AsbestosFree Why buy vermiculite in bulk...

One gallon of Sun-Gro horticultural vermiculite in a medium (A-2) grade, four times the volume of our quart bag. It absorbs water evenly and holds it, for dunk and roll, casing top layers and keeping substrate hydrated through fruiting. It is asbestos-free and works with jars, spawn bags and bulk tubs. 1 galBag size A-2Medium grade Sun-GroHorticultural 4xOur quart bag AsbestosFree Why growers use vermiculite Holds moistureAbsorbs water evenly and helps keep the substrate surface hydrated. Even...

One gallon of Krum Grade AA coarse perlite for holding humidity in a fruiting chamber. Hydrated perlite gives off water slowly and evenly, so a damp layer in the bottom of a shotgun chamber or small tub helps keep the air moist between mistings. It is 100% pure volcanic rock with no plant food or additives, UV sterilized and bagged. The 1 gallon size suits a single chamber, a small setup or a refill. 1 galBag size Grade AACoarse KrumHorticulture UVSterilized No additives100% pure Why growers...

A 4 cubic foot bag of Krum Grade AA coarse perlite, about 30 gallons, for growers running many tubs, chambers or a whole grow room. A hydrated layer releases moisture slowly to help keep humidity steady. It is low-dust with a consistent particle size, and it is 100% pure volcanic rock with no fertilizer or additives. 4 cu ftBag size ~30 galVolume Grade AACoarse Low dustConsistent size No additives100% pure Why buy perlite in bulk Covers a lotOne bag sets up and refreshes many chambers and...

One quart of Sun-Gro horticultural vermiculite in a medium (A-2) grade. It soaks up water and holds it, which makes it the standard for dunk and roll on PF cakes and for topping off casing layers in bulk tubs. A quart rolls up to 24 PF cakes, and it ships sealed and ready to use. Unlike the coarse vermiculite found at many garden centers, this grade coats a damp cake in an even layer. 1 qtBag size A-2Medium grade Sun-GroHorticultural Up to 24PF cakes rolled AsbestosFree Why growers use...