Modern potting mixes

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• To: m*@ucdavis.edu
• Subject: Modern potting mixes
• From: d* f*
• Date: Wed, 06 Oct 1999 19:45:53 +0100

Quoting from the RHS Encyclopedia of Garden Plants (Bicknell), there are
three standardized mixes of John Innes loam based Compost


JI  No. 1

Suitable for seedlings, short term, and annual houseplants.  Ingredients
(by volume):

    7 parts sterilised loam
    3 parts peat (or substitute)
    2 parts sand

To each cubic metre is added:

    600g ground limestone
    1.2kg hoof and horn
    1.2kg superphosphate
    600g potassium sulphate


JI No 2

Suitable for larger, established plants.  Ingredients as for No.1 but
with double the quantity of fertiliser.

JI No. 3

Suitable for long-term, established plants.  Ingredients as for No.1 but
with triple the quantity of fertiliser.


David Field
London.  UK.

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