Hi, my garden was trashed by builders this year so I'm starting again with lawn and making the bed bigger. It's a sunny border, lovely soil. I already have some mature shrubs along the fence. I want to put things like echinacea, asters and rudbeckia in, for more actual flowers. I think these are perennials so will die down to nothing over winter. I'm stuck for ideas on what I can put in with these for a bit of green through the winter... Any suggestions welcome!