Answer: The most limiting factor to success with avocado trees is severe cold. Avocado is a tropical to subtropical tree that, with some exceptions, is best adapted to relatively frost-free areas. Some types are killed outright by moderate freezes and others have regenerated after sustaining complete death of all aboveground parts.
"Mexicola" is a cold hardy avocado (to 18 degrees) so you might want to give this one a try.
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