This gives an overview of the variety of composts available for growing in containers aswell as the different ingredients which can be added to change the properties of your growing media.
In Summary
Why we don't use garden soil to grow in containers.

A comparison of loam based (Soil based/John Innes) versus organic compost mixes.
A look at the organic choices for organic composts.
Peat free composts.
Vermiculite, perlite, silver sand, sharp sand/ grit sand, grit


A quick look at the current Which recomendations (Jan 2021) listThompson and Morgan incredicompost as a good compost to buy although it does contain some peat. Sainsbury Peat free did very well in trials for container growing but Aldi or Lidl compost was not tested. Westland John Innes for seed and young plants scored very poorly so that is one to avoid.

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