John Innes compost

John Innes compost is a set of four soil-based formulae for growing media, developed at the former John Innes Horticultural Institution (JIHI), now the John Innes Centre, in the 1930s and released into the public domain.

The formulae contain loam, peat, sand, and fertiliser in varying ratios for specific purposes. These composts are used to grow seedlings for planting out, as well as long-lived plants which remain in containers.

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