I read somewhere that you should put coal ashes around the base of the hollyhock plant once you have cut it back for the winter (post flowering, seeding etc). Does anyone know what this means? Is it literally ashes from a coal fire? I would have thought that would be toxic! Any help gratefully received.
Never heard that one. I would have thought you were right about the toxic.
Woodash is supposed to be good for someting but I can't remember what.
I wouldn't think that coal ash would do anything any favours - full of tar oils and so on, very nasty. Wood ash is potash, very good and to be recommended but don't let it touch the plant, just sprinkle round and about as it's very alkaline (or is it very acid?) anyway, one or the other.