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Checklist - Preparing for winter in subtropical areas
Watering. Start reducing the amount you water your plants in early fall, once the temperature drops below 65F. Avoid watering your plants during cool nights, as this may cause serious root rot.
Mulch. When a plant is protected by a thick layer of mulch, the root system stays healthy.
No Pruning. Avoid pruning, trimming, or pinching branch tips altogether during the fall and winter which encourages new shoots that are soft, tender, and very cold sensitive. Last trimming should be done no later than September - early October.
No Fertilizer. Avoid fertilizers during the winter. The main reason being the same as above for pruning: fertilizing promotes growth of the upper plant parts which should be avoided during the winter months. The last time for fertilizer should be no later than October.