Mushroom compost

Mushroom compost can often be bought cheaply in bulk for use as a soil conditioner or mulch. However, it often contains some peat which is no longer recommended for horticultural use due to the damage to peatland ecosystems which contribute to climate change. It is usually available as ‘spent’ mushroom compost, referring to the fact it is the compost left over from mushroom farming.

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Adding mushroom compost to garden borders at RHS Wisley. Image: Tim Sandall/RHS

Quick facts

Mushroom compost is a useful soil conditioner and mulch but may contain peat
Use it in the vegetable and ornamental garden
It is alkaline in nature
Avoid using mushroom compost around ericaceous (acid-loving) plants

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