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I'm new to perennials and would appreciate any advice. Last year I planted some bear root cuttings, amongst others were hollyhocks,sea holly and erinacea. Each hollyhock sent up a single spike which reached almost 11 ft in height.
Generally if I were to cut back perennials to a shorter height would this encoiurage additional stems being formed.
Certain perennials benefit from something called "the Chelsea Chop". It's done around the time of the Chelsea Flower Show. If you "Google" "the chelsea chop" the RHS site comes up which tells you about it. I tried it on some very tall yellow rudbeckias and they grew bushier and not so tall. Hollyhocks are meant to be tall and I don't think it would work for them. A lot are biennial and you'd just lose the main flower spike.