Same here Chelle, I'd rather grow things that are able to harmonize with the environment here. If they can't do it without chemical help, they don't need to grow in my garden. I'm rather fond of the critters, even if they do tick me off from time to time.
The Calchortus is in the same bed with a lot of tulips, and a random few were nibbled by rabbits, but the one clump of Calchortus must have been particularly tasty. Since the other 2 varieties are looking good, I'll try again.
Another late spring bulb I tried planting in spring last year is Triteleia 'Queen Fabiola'. It's offered in both spring and fall catalogs. Last year they did nothing, just a few random grassy leaves, but they have returned and are going to bloom this year! I'm always on the hunt for blue shades, if they tickle my fancy I'll order more this fall. Maybe fall planting is preferable?
