Growing lime in zone 10b

In zone 10b, lime does not follow a single annual bloom cycle the way deciduous fruit does. Persian limes produce multiple flushes throughout the year, with heavier bloom periods typically occurring in late winter and spring (February through April) and again in fall. Key limes bloom nearly continuously. Fruit set follows bloom by roughly 5 to 6 months for Persian lime; Key lime fruit matures faster, typically 3 to 4 months after bloom.

With no meaningful frost risk in zone 10b, there is no critical bloom window to protect. Harvest is effectively year-round, timed to individual flushes rather than a single annual season. The practical peak harvest window for Persian lime in this zone tends to fall from late summer through winter.

The primary management concern in zone 10b is disease and pest pressure rather than cold protection. Citrus Greening (HLB), spread by the Asian citrus psyllid, is active throughout South Florida and tropical growing areas. There is no cure; management focuses on psyllid control through systemic insecticides and prompt removal of symptomatic trees. Citrus Canker requires copper-based fungicide applications and strict sanitation practices, including tool sterilization and avoiding overhead irrigation. Both diseases are serious enough that sourcing trees from certified, disease-free nurseries is the most consequential care decision available.

Where coastal salt accumulation is a concern, raised planting beds or container culture with filtered irrigation water can significantly extend productive life. Sooty Mold on lime typically follows scale or aphid infestations; controlling the underlying pest population eliminates the mold's food source and resolves the problem without direct treatment.