Bulk Vermiculite for Mushroom Cultivation

$4.99

In Stock. Ships in 1-2 business days.

Improve moisture and nutrient retention!

This asbestos-free, odorless, horticulture-grade vermiculite provides superior moisture and nutrient retention when used as a substrate additive. It also allows for greater aeration, an essential component for larger flushes and faster colonization.

  • A3 medium coarseness is ideal for mushroom cultivation, as it has greater water retention capacity and can be used for external casings.
  • Ideal for use in cake-style, manure-based, and straw-based mushroom cultivation methods.
  • A thin layer can be added to the base of a fruiting chamber to increase ambient humidity.
  • OMRI Certified - product can be used in certified organic operations under the USDA National Organic Program.

⚠ CAUTION:

Avoid creating dust. Breathing dust may be harmful to your health. Use with adequate ventilation or with respiratory protection.

Cautions & considerations
  • Skin contact: Repeated or prolonged contact may cause irritation. Wash off with soap and water.
  • Eye contact: May irritate eyes. Flush eyes with generous amounts of water for at least 5 minutes.
  • Inhalation: Upper respiratory irritant: May aggravate pre-existing respiratory conditions. 

Frequently Asked Questions

We recommend absolute beginners start with our Spray & Grow Kits, which make growing mushrooms at home super easy.

We want you to have the best possible experience with every North Spore product and guarantee free replacements within 30 days of receipt for any damaged, contaminated, or unusable product.

Absolutely! Mushroom cultivation is a great activity to do with the whole family, whether you'd like to grow indoors or outdoors. If you're new to mushrooms, we recommend starting with a Spray & Grow Kit or a Plant & Grow Kit – both make it easy to grow fresh, organic mushrooms at home.

We are vertically integrated — from culture work all the way to spawn and substrate production — ensuring a quality end product. And our staff mycologists keep up to date on all best practices in our field. Additionally, we have a dedicated QAQC team that tests every batch of grain and substrate before it’s inoculated.

Cluster of brown-capped mushrooms with long, light-colored stems against a white background.

Your Trusted Source for Premium Mushroom Growing Supplies

Whether you’re growing mushrooms at home, in your garden, or at a commercial scale, we offer everything you need to cultivate success. We start with the highest-quality OMRI-listed ingredients, mix them in our state-of-the-art facility, and inoculate them in our custom-built lab, so you can rest easy knowing your product will yield the best results.

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