This is a tedious beginner gardener question. My 'Wargraves Pink' and 'Kashmir Blue' are thriving and have done really well during the rain spells. But my 'Mrs Kendall Clark' which were bought and planted a month ago only bloomed for 2 weeks then no new flowers and the foliage has orangey brown tints on the edges of the leaves.
I've asked this on another forum thread but thought I'd better get the subject of Geraniums on it's own thread - sorry if there's another Geranium thread which I haven't found.
My problem maybe arises from reading about plants in too many places of reference. The plant label, websites and various old and new books. Sometimes they give different advice and I'm in a beginners fudge of trying different types of advice.
My understanding had been that 'Mrs Kendall Clark' would bloom through to the autumn and that you can just leave them to their own thing. Then I read that you should deadhead them or cut the stems at the base to prompt more growth and blooms. I have 3 of these plants so deadheaded the flowers on one, cut the stems at the base on the 2nd and left the 3rd one to do its own thing. None of them have produced new flower stems or blooms and so I'm wondering one of three things:
I added a 'Summer Mulch' to the bed either a month or two months ago, can't remember which. If I've carelessly hit the stems with the mulch would this have caused them to stop flowering and the foliage to turn orangey brown? It's heavy clay but it had a lot of nursery bought garden compost added very early spring and the other Geraniums in this bed are romping on.
Am I mistaken that 'Mrs Kendall Clark' should grow and bloom through to September? Should they have stopped blooming round about now?
As the plants were bought in pots and already in flower - should I have fed them something specific to keep them going or unlike the other Geraniums do they depend on constant sunshine to keep them going?
In most gardens where I see Geraniums they are blooming like mad and seem to just get left to get on with it. I feel I've messed up in some obvious way but am just not 'getting it'. I never hear anyone say they have problems with Geraniums and had thought I'd be able to just leave them more or less to spread and bloom all summer to autumn. Oops!