Interesting comparisons, Arlene.
I planted Coreopsis 'Zagreb' only once and it only lasted a couple of years.
Your experience with Gaura has been very different from that of Loretta and me.
There's obviously differences in growing conditions between different locations and also between different locations within the same garden. Merlin's Hollow contained 1500 different perennials. One contributing factor was David's use of all the microclimates that the 3/4 acre garden contained.
