Welcome, Sarah! You asked when's the best time to see South African bulbs in bloom in California. Bloom times are spread out (with some stuff in bloom already), but the greatest diversity, especially for Moraeas, is late February to March. UC Berkeley's collection is probably the best. There is supposedly also a South African bulbs planting area at the UC Irvine botanical garden, but I haven't seen it. Mike San Jose, CA (zone 9, min temp 20F / -7C)