Buy Grow Kits XXL: Organic Gourmet Mushrooms from Your Own Block
Large, fully colonised organic substrate blocks of about 3.5 kg: set up, keep humid and harvest fresh shiitake, lion's mane or king oyster mushrooms over several flushes.
- EU organic certified
- Approx. 3.5 kg substrate block
- Several flushes
- Guide via QR code
Which grow kit is right for you?
Shiitake
Savoury shiitake for pan, wok and soup. You start fruiting with a simple trick.
- Let it brown for 4–6 weeks
- Cold shock + water bath starts fruiting
- Fruits at 10–25 °C
- 2–4 flushes
Lion's mane
White, coral-like spines, mild in flavour, with a texture like tender chicken.
- First clusters after 10–15 days
- Around 90 % humidity
- Cool spot such as bathroom or cellar
- 1–2 flushes
Order more and save: 10% off from 4 pieces, 20% from 8 pieces, 25% from 12 pieces.
The grow kits compared
| Shiitake | Lion's mane | King oyster | |
|---|---|---|---|
| Start | Brown for 4–6 weeks, then cold shock | Cut slits, keep humid | Set up, open the foil |
| Fruiting | 10–25 °C, above 85 % RH | cool, around 90 % RH | 15–20 °C, around 90 % RH |
| Flushes | 2–4 | 1–2 | 1–2 |
| Rest between flushes | 2–3 weeks | 3–4 weeks | 2–3 weeks |
Until you start, store cool, dry and frost-free below 20 °C. RH = relative humidity. Delivery 2–4 weeks, small quantities usually from stock.
FAQ: grow kits XXL
What is an XXL grow kit?
An approx. 3.5 kg organic substrate block that is already fully colonised by mycelium. Just set it up as described in the guide and keep it humid – the mushrooms grow straight out of the block.
How many harvests will I get?
Shiitake usually gives 2–4 flushes, lion's mane and king oyster 1–2. Between flushes the block needs a rest of 2–4 weeks.
Where should I place the kit?
In a bright spot out of direct sun with high humidity – bathroom, cellar or kitchen work well. No radiator nearby, no draught.
How do I store the kit before starting?
Cool, dry and frost-free below 20 °C. The king oyster kit keeps about 3 months refrigerated.
How is it different from a growing kit?
The XXL kits are larger and give more flushes. For a very first try, the Fresh Mushroom Box from our growing kits is even easier.
What do I do with the block after the last harvest?
The spent substrate is a valuable organic fertiliser for compost or raised beds.
From our organic mushroom farm in Schleedorf
We produce our grow kits, grain spawn and plug spawn ourselves – at our EU organic certified mushroom farm in Schleedorf near Salzburg, Austria. Short distances mean fresh, vigorous mycelium for you.
Sebastian Reindl, founder of Stoff'n, is the author of the book “Faszination Pilzzucht” (Stocker Verlag). Its know-how goes into every one of our guides.
More for your mushroom growing
Questions? We are happy to help
Something not growing as expected?
Check the matching guide and our FAQ – or write to us via the contact form, ideally with a photo. We will get back to you personally.
