You'd probably get better info from the medit-plants list, but here's what I know... --Here in Zone 9, the ones I have tried are very easy to grow. I can't speak to hardiness in your area. --They like lots of sun, which may be an issue in your area. --Mine are slow-growing on my hill, which is south-facing, nutrient-poor clay subsoil. The good news is that I've had no problems with root rot. --They appreciate some summer water here, but I bet they would not need supplemental water where you are. --The clumps get crowded over time. I probably need to divide mine. --The flowers are worth the (minimal) effort. Mike San Jose, CA (zone 9, min temp 20F)