Mushroom Growing Supplies: Straw Pellets, Filter Bags & Foil
With grain spawn and the right supplies you make your own mushroom substrate: organic straw pellets are ready in minutes, filter bags keep contaminants out, tubular foil is cut to length.
- Organic straw pellets
- Filter bags with 0.2 µm filter
- Tubular foil cut to length
- Guide via QR code
What do you need for what?
Organic straw pellets
Pellet production reaches over 70 °C – so straw pellets are practically sterile. Add boiling water and your substrate is ready in minutes.
- 5 kg, EU organic quality
- Makes about 15 kg of moist substrate
- For oyster, lemon oyster & more
- Compact and easy to store
Filter bags M & L
The filter lets oxygen through but keeps spores and bacteria out – the standard tool in mushroom growing.
- M: 20 x 12 x 50 cm, e.g. for 0.5 kg straw pellets
- L: 20 x 12 x 65 cm for larger batches
- Heat resistant, 0.08 mm thick
- Packs of 10, 50 and 100
Tubular foil 300 mm
Cut grow bags and mushroom columns to exactly the length you need – robust and affordable.
- 300 mm wide, 100 µm thick
- Rolls of 10 m and 50 m
- For straw pellets, soaked straw, columns
Mixing ratio for straw pellets
| Straw pellets | Water | Moist substrate | Grain spawn (approx. 10 %) |
|---|---|---|---|
| 0.5 kg | 1 litre | approx. 1.5 kg | approx. 150 g |
| 5 kg | 10 litres | approx. 15 kg | approx. 1.5 kg |
Pour boiling water over the pellets, let cool below 35 °C, then mix in the grain spawn.
How to make your substrate
- Soak: Pour boiling water over the straw pellets in a filter bag or bucket (1 : 2).
- Cool: Leave covered for 12–24 hours until the substrate is below 35 °C.
- Inoculate: Mix in about 10 % grain spawn and close the bag above the filter.
- Colonise & harvest: Let it colonise at 20–24 °C, then cut crosses and harvest.
Every product comes with a step-by-step guide – also via the QR code on the label.
FAQ: mushroom growing supplies
Do I need to pasteurise straw pellets?
No. Pellet production reaches over 70 °C, so the pellets are practically sterile. Boiling water for soaking is enough.
Which mushrooms grow on straw pellets?
Mainly oyster, lemon oyster and pink oyster mushrooms. King oyster works too but yields more on wood substrate. Shiitake need wood.
Filter bag M or L – which one fits?
Filter bag M (20 x 12 x 50 cm) is ideal for 0.5 kg straw pellets. Filter bag L (20 x 12 x 65 cm) suits larger batches and pieces of wood.
Can I reuse filter bags?
For clean results we recommend using each bag only once.
When do I use tubular foil instead of filter bags?
For soaked straw, large grow bags and mushroom columns where you want to choose the length yourself.
Do I also need spawn?
Yes – the supplies are the substrate, the grain spawn brings the mushroom. Everything together comes in the Home Mushroom Growing Kit.
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.
