The course › Part Four — From Bag to Harvest
Module 12

Bagging and planting the spawn

Where the two lines meet. It is quick work — and everything you have done up to now rests on it.

Lessons in this module

3 lessons · 5 min

0 of 3 lessons done

The explanation

How tightly to pack

There is a right firmness when packing substrate into plastic.

Too loose and there are large air gaps inside. The mycelium cannot travel continuously and colonisation is slow. Too tight and there is no air at all — and mycelium needs air as much as you do.

What you want is a firm bag that stands up without slumping, but still gives slightly when pressed.

Cooling before planting

A hot bag cannot be planted. Heat kills mycelium — the very same heat that killed the microbes earlier.

Wait until you can hold it comfortably for a long moment without burning your hand.

More is better

When planting spawn, being sparing is expensive. More spawn means more starting points, faster colonisation, and less opportunity for mould.

The spawn you save today you pay for in spoiled bags later.

Left: packing substrate into plastic. Right: the spawn bottle beside the waiting bags — where the two lines meet.
In the book — still being written
How much spawn per bag

And the weight of a freshly made bag.

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