Answer: Brugmansia (trumpet vines) are natives of South America. Moderately warm temperatures all year around make them especially happy. They can be grown in your Central California garden, but will be damaged by frost. To complicate matters, some trumpet vines will refuse to bloom if summer weather is hot (and yours can be). Without knowing exactly which trumpet vine you're growing, it's difficult to tell why it isn't blooming. In general terms, trumpet vines like full sun to full shade, grow well in average soil, should be watered regularly and fed infrequently. If yours isn't blooming, they may simply need to be pruned (because they bloom on new wood). At this point, continue to water deeply each time you water, and wait until leaf buds begin to swell in the spring. When they do, prune the plants to encourage new stem growth, which should produce flowers all summer long. Best wishes with your trumpet vines!
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