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Everything I buy from this place has turned out well from grow bags to substrate

Everything I buy from this place has turned out well from grow bags to substrate. Will continue to patronize often.

Excellent experience

Excellent experience as always!

Substrate seems to be good

Substrate seems to be good. Presently colonizing and seems to be free of any contamination. Time will tell but so far so good.

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Earthworm Casting Mushroom Substrate

Name: Earthworm Casting Mushroom Substrate
Brand: Mushroom Spawn Store
SKU: Sub5
Price: 25.99 USD
Availability: InStock
Rating: 4.93 (14 reviews)

$25.99 USD

Sale Sold out

Shipping calculated at checkout.

Pay in 4 interest-free installments for orders over $50.00 with

Volume discount by weight 5# 10# 20# 30#

Product variants

Give your mushrooms the nutrients they need for a high-yield, healthy culture! With our premium manure-based mushroom substrate, your bountiful harvest is only a few steps away. Combine each bag with 1 of our Sterile Mushroom Grain Spawn Bags for a 50/50 mix, and you can easily get started on your mycology journey.

Fully sealed and sterile substrate (not pasteurized)
Perfectly hydrated and ready to use in a mono-tub
Clear usage instructions for beginner mushroom growers
Packed with nitrogen, phosphorus, potassium, and plenty of other nutrients that facilitate mycelial growth
Sold in 5-pound bags

Why Use Our Mushroom Substrate?

When it comes to mushroom growing, the type of substrate you use can make or break your mushroom culture.

Get started right away

All nutrients your mushrooms need, ready-packed in a 5-pound bag. We use organic materials mixed in with coco coir for aeration, gypsum, and water, for a simple yet effective mix bound to keep your mushrooms growing plenty!

Minimal contamination risk

Each mushroom manure substrate bag is fully sterilized and sealed inside a durable bag. Each bag is also equipped with a self-healing injection port that improves safe inoculation rates.

Grow a wide variety of mushrooms

Manure mushroom substrates nutrient-rich composition works great for lots of common dung-loving mushroom species like the button mushroom or portabello and your favorite medicinal variety too ;) Always check your local regulations to learn about what you can and can’t grow.

Free shipping offer is to the continental U.S. only.

We try to balance cost and speed, free orders ship ground and are typically delivered in 3-5 business days. For most items you can upgrade to USPS Priority for $10-40 (depending on weight) and get it in 1-3 days.

We ship Monday-Friday. Orders ship in 1-2 business days.

All products ship discreetly in plain brown boxes.

Due to the nature of the product we do not offer returns.

We do offer FREE REPLACEMENT or a refund for damage in shipment or contamination on arrival. Please inspect your order upon arrival and contact us immediately if the item is damaged or contaminated so that we can make it right.

Should items be damaged in shipping or arrive contaminated (unlikely), we will replace/refund them at no cost to you.

Please provide us a well lit high resolution photo of the damage and a photo of the injector port in your email to customer.service@mushroomspawnstore.com

We reserve the right to deny replacement of a bag if it looks like it has been injected with spores or liquid culture of any kind.