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Frost-sensitive plants such as hibiscus, frangipani, passionfruit, citrus, deciduous fruit trees, and some vegetables can be adversely affected by frost.
Frosts occur on cold clear nights when temperatures get below freezing. Protect sensitive plants with a cover of bedsheets, newspaper or light blankets, but not plastic. If you were too late with the protection don’t prune frost-affected growth until spring as pruning will stimulate new growth that will be even more vulnerable.