Answer: Avocado's are from Mexico and Guatemala, but they grow well in the warm winter areas of Southern California. Established trees are hardy to about 24F degrees. Your little trees won't survive the winter outdoors on Whidbey Island. Bring them indoors for the winter and put them in a bright spot. Take them outdoors again in the spring. In a few years, when the trees mature a little more, you can try planting them outdoors in a protected area. If they have a chance to grow and become established, they might live through an occasional harsh Pacific Northwest winter.
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