The simple dictionary definition of compost is as follows: a mixture that consists largely of decayed organic matter and is used for fertilizing and conditioning land. Compost consists largely of decayed carbon-based matter like fruits, vegetables, manure, grasses, dead leaves, and woody debris.
Compost is a misleading term in UK horticulture as it covers both managed organic matter decomposition and growing media for example potting compost. This learning tool is aimed at the former only.
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