I'm not sure if this is the right place for this question but... Later in the summer after they have bloomed, what happens to the leaves? Do they turn brown and die like other early spring bloomers? I'm trying to plan a shade area and was wondering if the leaves did die back around July. If so, I'd like to plant another ground cover along with it. My parents have a lot of periwinkle which I like the look of. Also, am I going to be able to grow these very well in Zone 8? I've seen that they do better in Z2-7. Thanks for any info! ~Amy