wildrose, your border is beautiful. I know what you mean about having a sudden flush of colour then nothing, and everything looking a bit tatty. I put salvias, helenium, rudbeckia, achillea and veronicastrum verginicum in for late flowers. The salvias are out now, and should last another month, I think, but the helenium are only just starting to flower and the veronicastrum will take another month. So, some suggestions for keeping the show going. The bees love these plants too, so an added bonus. In the (not very good) picture, you can see the salvias, the achillea just coming into colour and one orange helenium just in front of the salvias. And a picture of a bee (I haven't seen one like that in the garden before).