I have been playing it for a few weeks now (ok, not totally steadily) and have 4 nurseries going, sometimes all at once. The best that I have done is that one of them has 5 of the magic plants. I still don't have all the bugs either. I think that my problem is that I love each one of the plants that will cross pollinate for me (they don't always comply), and so then I can't bear to give them up, so I have waaaaaay too many seeds and varieties. Are the purple plants kind of magic? They sure seem to be hot sellers, as well as venomous grass, which sells fast anywhere I offer it-the highest I have asked is $136 and i recieved it.

Virtual Seed Tray (in the guide section) will let you save extra seeds.