I'm a novice gardener and have 3 fairly big flower beds to fill. We're going to have to grow some plants from seed I think otherwise it's going to be unaffordable, but I'd like to buy a few nice perennial plants to get us going.
We've been in to the big chain garden centres like Wyevale and Dobbies, but the plants seemed so expensive (£30 for one teeny clematis 
). Is there a better option?
We're in Warwickshire if anyone happens to know a good local place.