Sterile grain spawn bag

Sterile Rye Grain Bag

Hydrated, supplemented and sterilised organic rye grain with a built-in injection port. The clean, reliable way to grow your own colonised spawn for any mushroom species.

€13,90

Weight of a Bag

Package of

Guaranteed bag sterility Free shipping over €100 Made fresh to order

Customer reviews

What growers say.

4.8 ★ average rating
1500+ growers served
27 EU countries shipped to
“The cleanest bag I have ever worked with”Jonas K. · verified grower, Germany

Why this bag

One sterile bag, zero guesswork

Universal spawn

Hydrated, supplemented and sterilised organic rye grain, ready to inoculate with the spores or liquid culture of any mushroom species.

Built for clean results

A 0.2 micron filter patch and self-healing injection port let you inoculate safely, with no flow hood needed.

Ready when you are

Pre-sterilised and fully prepared. Inject your culture, let the grain colonise, then spawn to your substrate.

Strong, even colonisation

Premium rye grain gives fast, even colonisation for a dependable, contamination-resistant start. Forgiving for first-timers, trusted by experts.

Simple process

From bag to spawn in 3 steps

01

Inoculate

Inject your spores or liquid culture directly through the self-healing injection port. No flow hood or open transfers needed.

Day 1

02

Colonize and shake

Keep the bag at 20 to 25°C in a dark spot. When about 50% colonised, shake to break up and redistribute the grain for faster, even colonisation.

Days 7 to 14

03

Spawn to substrate

Once the grain is fully colonised, mix it into your substrate, logs or garden bed. The colonised grain jump-starts a fast, even grow.

When fully colonised

The product

Everything you need, in a single bag

Make your own clean, vigorous spawn at home. Each Freshrooms grain bag is filled with hydrated, supplemented and sterilised organic rye grain, sealed with a 0.2 micron filter patch and a self-healing injection port for safe inoculation.

Inject your spores or liquid culture, let the grain colonise, and shake at around 50 percent to speed up an even, dense colonisation. Once fully colonised, mix the grain spawn into your substrate, logs or garden beds. It works as a universal spawn for any mushroom species you want to grow.

  • Grain Hydrated, supplemented, sterilised organic rye
  • Use for Spawn for any species, mixed into substrate, logs or garden beds
  • Built in 0.2 micron filter patch and self-healing injection port
  • Made in Sterile, lab-controlled conditions, tested for consistency

Questions

Before you begin

We aim to dispatch every order within 2 to 4 days. Because each bag is prepared fresh to order for the highest possible quality, preparation can occasionally take a little longer during busy periods. If that ever happens with your order, we will keep you posted.

Once your bag is dispatched, delivery within the EU takes 2 to 6 days. We always ship to your home address, tracked door to door.

Sealed bags stay viable for up to 4 weeks at room temperature, or up to 3 months refrigerated. We recommend inoculating within 2 weeks for the strongest colonization.

Keep the sealed bag in a cool, dark place away from direct sunlight. The fridge is ideal if you are not inoculating right away.

Yes. The bag is pre-sterilised and ready to inoculate, so you add your own spores, liquid culture, agar or pre-colonized spawn through the injection port. The genetics are your choice.

Hydrated, supplemented and sterilised organic rye grain, ready to inoculate. A 0.2 micron filter patch and self-healing injection port are built in. There is no substrate inside, this bag is made for growing your own spawn.

Send us a photo and our growers will diagnose it. If the bag arrived contaminated or faulty, we replace it free of charge. That is our grow promise.

Complete your setup

Goes well together

Your first harvest is closer than you think

Start growing

Ships within 24 hours. Grow promise included.