I wonder if anyone would be kind enough to explain what the main
differences are between the black soil like John Innes formulas and the
"multi-compost" type which is lighter in colour and springier?
Perhaps more specifically, I have a small Leylandii screen on a balcony
in 10 inch pots which I'm planning to move to 12inch ones that are
currently in the multi-purpose compost. Would they be better off in the
black John Innes soil ? And in general when to use soil like John Innes
and when to use the compost stuff?
I've been searching around the internet for hours but haven't really
found an answer to this - maybe its so simple nobody feel the need to
Thanks in advance for any advice on this.