I treat Ornithogalum dubium just like all my other Cape Bulbs here in inland coastal valleys of Southern California. After everything goes dormant in late spring/early summer, I place them in an area out of the sun, but still outside and warm and completely dry throughout the summer. It seems that every autumn at least some of them come out of dormancy after the first rains (or first watering as the case may be). They multiply rather well, so I don't know if some remain in dormancy throughout the next winter. And there are always some that send up flower spikes, although they never seem to get as large as they were when purchased from Trader Joe's. Actually, they seed about a lot and so they can be like weeds, showing up in some other pot they don't belong in. In my experience, dormant Cape Bulbs have no problems with being watered/rained on throughout the winter, i.e., cool weather. It's a lot trickier making sure they don't rot if the leaves are still green when the weather gets hot in early summer. --Lee