Have you tried using a guide? Breeding green mums isn't simple, but they are easier to get than most of the purple hybrids and black cosmos. They have an odd breeding path that makes them hard to get if you are guessing what you are supposed to do, but if you know what to do they're relatively easy to get compared to other hybrids. If you're just having really bad luck, then hopefully things will turn around for you.My latest thing is to try to make my own green mums. It's so hard! I've played since launch and never been able to make them.
If you wanted a blue rose I'll happily give you one.I prefer to do it myself. It is exciting to me when i open my game and go around my island searching for new hybrids. The only type i considered buying so far is the blue roses because ugh!!