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There might be challenges growing Calochortus in the UK. In general, the bulbs need a dry rest in the summer while they are dormant. Moisture around the bulb at this time normally causes the bulb to decay.
Thanks to Robert and Arturo for their thoughts on growing Calochortus. A dry rest over the summer is not difficult where I am in the south east of England; I'm told we get less rainfall than in Mexico. However hot and dry could be difficult. Tulip bulbs tend to need a hot dry summer. Some tulip cultivars flower reliably year-on-year if left in the ground here but the majority decay away producing smaller and smaller leaves for a few years until they vanish completely. How do tulips do in California?