Hardy Palm and Subtropical Board
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Re: Subtropical vs Temperate limits
good points. FWIW, a number of "temperate" plant species are native to florida (at least the northern parts) like red maple, sweetgum, and flowering dogwood. OTOH some of those "temperate" plants that grow in the "deep south" MIGHT actually not be fully hardy or fully happy in northern parts because they are adapted to shorter warmer winters and longer warmer summers---it's called "provenace" by foresters. FWIW and in apparent contradiction to all this---many natives of the Channel Islands of extreme southern California like quercus tomentella (island oak), prunus lyonii (Catalina cherry), cupressus guadalupensis, (Guadalupe cypress) and lyonothamnus floribundus (Catalina ironwood)do just fine way up north in Oregon. you just never know for sure, LOL.
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