Vermiculite for Mushrooms 1 Gallon | Sun-Gro A-2 Medium – Midwest Grow Kits
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Vermiculite A-2 Medium (1 Gallon)

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$550
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1 gallon of Sun-Gro horticultural vermiculite, medium (A-2) grade. Asbestos-free and ideal for dunk and roll, casing top layers and moisture retention during fruiting.


Description

This 1-gallon bag of Sun-Gro horticultural vermiculite is a medium (A-2) grade that absorbs water evenly and holds it, making it a go-to for dunk and roll, casing top layers and moisture retention in mushroom grows.

It's four times the volume of our 1-quart bag, sized for growers running more jars or tubs. Roll colonized cakes in it after dunking, or spread it as a top layer in your monotubs to keep your substrate hydrated through fruiting. It's asbestos-free and works with jars, spawn bags and bulk casing setups.

  • Sun-Gro horticultural
  • Medium (A-2) grade
  • Asbestos-free
  • Dunk & roll
  • 1 galBag size
  • A-2Medium grade
  • Sun-GroHorticultural
  • 4xOur quart bag
  • AsbestosFree

Why growers use our vermiculite

  • Holds moisture – Absorbs water evenly and helps maintain humidity at the surface of your substrate.
  • Even coating – The medium grade sticks to a damp cake in a uniform layer for dunk and roll.
  • Casing top layer – A thin layer over bulk substrate helps keep it hydrated during fruiting.
  • Versatile – Works with jars, spawn bags and bulk casing grows.
  • Asbestos-free – Sun-Gro horticultural grade.

What's included

  • 1 gallon of Sun-Gro horticultural vermiculite, medium (A-2) grade

How to use it

  1. Dunk. Rinse colonized PF cakes and soak them in clean water to rehydrate.
  2. Roll. Roll each damp cake in dry vermiculite until it's evenly coated.
  3. Or top-dress a tub. Spread a thin layer over your bulk substrate to help hold moisture at the surface.
  4. Fruit. Move cakes or tubs into fruiting conditions and keep humidity up.

Storage tip: Keep leftover vermiculite sealed and dry so it stays clean for your next grow.

Specifications

Specification Detail
Brand Sun-Gro Horticulture
Grade Medium (A-2)
Volume 1 gallon
Asbestos Asbestos-free
Uses Dunk and roll, casing top layer, moisture retention, jars, spawn bags and bulk grows

Other sizesNeed less? Grab the 1-quart bag. Growing at scale? See the 4 cubic foot bag of A-2 medium vermiculite.

FAQ

What grade is this vermiculite?

It is a medium (A-2) grade horticultural vermiculite from Sun-Gro.

How much is in the bag?

One gallon, which is four times the volume of our 1-quart bag.

Is it asbestos-free?

Yes. It is asbestos-free horticultural vermiculite.

What can I use it for?

Dunk and roll on PF cakes, as a casing top layer in monotubs, and for moisture retention in jars, spawn bags and bulk grows.

What other sizes do you sell?

We also carry a 1-quart bag and a 4 cubic foot bag of A-2 medium vermiculite.