Posted: 02/08/2015 at 14:14
Already mentioned astilbes. There are some superb varieties now......if you get those with new spring red or copper foliage,,like Vesuvius, Fanal, etc., you will get colour from early spring right up to late August.
Astrantias..tall white like jumble hole or superstar will give you flowers all summer.
Add a tall plant like kmiphofia, aconitum, veronicastrum or an actea and you have a nice bed