Sempervivum don't need much water; I've lost some because there was an incline and they just weren't happen at the bottom. But there aren't too many places in my garden I can place them; you certainly can't put them in the back where they would get lost.
The one thing I wish I knew years ago when I began gardening is which plants are herbaceous. I have a lovely "lower" garden where I planted about five astilbes as I love their flowers as well as their leaves. (For me, perennials have to have pretty leaves so that I don't just look at "boring" when they're not flowering.) But because I placed all five astilbes in their own area, in the winter it looks as though I have no garden--nothing. So this year I will fill in that garden with some plants that are evergreen. Another lesson learned.
