Custom Order from the Lab


Grain Spawn

3.5lbs. of mature mushroom mycelium on organic rye
Average Lead Time: 2-3 weeks

3.5 pounds of organic grain spawn
Average Lead Time: 2-3 weeks
$45 - $60 suggested donation

Grain spawn is probably the most widely-used, consistent and effective starting point for mushroom cultivation projects. One bag of spawn can inoculate 10 times its weight of bulk substrates such as straw, sawdust and wood chips. It can also be used as a spawn "master" to first inoculate more sterilized grain, then substrate, resulting in a 10,000% increase in biomass!

Because the mycelium has had a running start in sterile conditions, mature grain spawn is naturally resistant to contamination and can be handled directly for spawning bulk substrates like sawdust, wood chips, dowels, and straw.

Rye is a favorite of the cereal grains. Its dense structure and high nutritional content supports the luxuriant growth of most desireabe mushroom species. USDA certified organic grain, grown in Oregon.

We do our best to begin custom orders within 1-2 business days. We will inoculate your grain spawn, incubate it under observation, mix it when needed and send it when the mycelium has fully enveloped the rye. We strive to produce spawn that is healthy, vigorous, clean and arrives in a state of active growth, ready for use.

The whole process usually takes 2-4 weeks, though this may vary depending on the species and the phase of the moon. We'll reach out with an ETA as soon as we receive your order, we'll keep you in the loop about its progress and we'll send you a shipment notification with tracking as soon as it's ready.

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.