At UC Berkeley you will find many species planted in the ground displaying a natural habit, something very important to check against your own growing conditions. Certainly a fabulous place worth visiting several times. And tended by great experts that love their jobs. There used to be an incredible collection of South African geophytes at the UC Irvine Arboretum but have no idea if it still exists. Of course there are private collections as well like that of our President Nhu with large numbers of varieties but people is so busy nowadays that arranging a visit could be a problem. One thing is certain: your visit to UC Berkeley will be a turning point in your bulb (and many other plants) growing life.