Soil based compost.
I have two new hydrangeas (Miss Saori) that the grower has suggested planting in John Innes No2, trouble is I can't get any anywhere. I have some good quality multi purpose compost, could I mix that with some purchased bagged topsoil, would that be the same sort of thing?
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.