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changing from pink to blue...a clear illustration of the affect of pH on plants.My garden soil must have got more alkaline, possibly through watering with 'hard' tap water during hot weather last summer, hence the pink flowers this year. I'll need to change

there are mixtures, as I'm often told these sell best. They're not for me. Their ‘kaleidoscope’ effect is a little brash and lacking in – how can I put this? -  style. I want to choose the colours and theme my pots to create more impact. Planting several pots

most of them a second thought. Well, that's why I planted them in the first place – to be reliable performers that look after themselves.The problem with leaving perennials alone is that the central parts of plants grow less productive over time