3.5lbs. Organic Dung-Lover Mushroom Substrate

Pasteurized manure-based substrate in a mushroom grow bag

Organic Dung-Lover Mushroom Substrate
$25 - $35 suggested donation
3.5lbs. of pasteurized organic manure-based mushroom substrate in a mushroom grow bag.

Dung-loving mushrooms thrive in substrate that has been pasteurized, rather than sterilized, to preserve some of its beneficial microorganisms. We carefully source, age, sift, shred, mix, hydrate and pasteurize our substrate by hand. Made with grass-fed organic horse and/or donkey manure.

We package our substrate in specialized mushroom bags that sport a large, high-airflow 5 micron filter designed for growing the mushrooms right in the bag. Just add mature grain spawn, mix, incubate, harvest, repeat!

This kit is specifically formulated for dung-loving mushrooms and uses pasteurized manure. We do not work with these mushroom varieties at Fungaia, so we have partnered with our friends at True Blue Genetics to get you a discount on great genetics.

Organic Matters

Mushrooms bioaccumulate toxins at many times the ambient levels of their environment. While this is good news for our soils, it's not for our bodies. With ever-increasing concentrations of pesticides and other toxins in our soil, food and water, it's more important than ever to find sources we can trust.

At Fertile Substrate, we are meticulous about our ingredients, from our spring water to the pastures where we wrangle the choicest poops. We believe that every detail has significance, and we are dedicated to our craft. It won't be hard to see the difference, and we promise that your fungus will thank you, too.

Our Joint Guarantee

We guarantee that your substrate will arrive intact and free of contaminants or we will replace it. Once it has been inoculated, this gurantee only applies if you used Fertile Substrate grain and a liquid culture from True Blue Genetics.

Note: shipping 2 bags costs the same as 1.

Info & Terms

We are committed to providing exceptional customer service.

How It Works

For both privacy and security, we do not process credit cards on this website. Instead, after you place an order, you will receive an email with a link to pay using a secure, trusted third party (or instructions if paying with cash). Unpaid orders will be cancelled after 7 days (30 days for cash orders).

We do our best to process invoices and ship orders within 1-3 business days.


We do not sell or distribute any personal customer data to any third party for any reason.

Cancellation Policy

Excluding custom orders, your order may be cancelled for a full refund at any time until they have been shipped. Once an order is shipped it will not be refunded.

Return Policy

Due to the perishable nature of live biological specimens, we do not accept returns. In the rare case that you should find, with reasonable assurance, that our products were compromised in any way upon arrival, we will promptly replace them at no cost to you. We do not offer refunds after products have been shipped.

Lost or Damaged Packages

When an order is shipped, we provide tracking information. If a package is lost or damaged in transit, we will work with the postal carrier to recover the cost and send a free replacement. However, we are not responsible for orders which are lost or misplaced after they have been delivered by the carrier.


We reserve the right to refuse service to anyone for any reason.