Hardy Palm and Subtropical Board
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Re: Avocado orchard.
elevation is not necessarily the chief factor but topography and degree of slope---think the most important thing is a situation that allows the cold air to "drain" away (generally down slope) from where you and your plants are
the upper southern oregon coast
USDA zone 9a (Sunset zone 5)
DRY cool summers and WET cool winters
grow eucalyptus, banksias, telopeas, grevilleas, bottlebrush, mexican pines and oaks