Answer: Tea Tree (Leptospermum) is native to Australia and should be happy throughout the winter in your mild gardening region. No special treatment is required. Based upon flower description, I'd say you probably have Leptospermum scoparium, the hardiest of all the tea trees. This is a slow growing tree/shrub, with a mature height of about 5'.
Provide good drainage, and it should winter over without problem. These are carefree plants; prune only the unruly branches it produces.
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