Height in the border
I like to have some taller plants in my mixed borders, but I haven't had a lot of success. I've tried and killed delphinium and hollyhock several times. I do have Russian sage which is fairly tall but spreads too much to have the look I want. I've had some luck with veronica, but it's not as tall as I'd like, and not always a robust grower. I'm thinking of trying verbascum. Has anyone had luck with them? I like foxgloves a lot, but they seem to fade away. I have seen some that are true perennials, namely a pink and a yellow, so if anyone has any experience with either of those please let me know.
Of course, any other suggestions would be most welcome!