Hardy Palm and Subtropical Board
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Re: Eastern Washington vs West
well, think the exact same situation happens in Oregon and California as in Washington. the Cascades and Sierras form a barrier between the milder more oceanic and moist (in the winter) climates of the western portions of all 3 states. the east side of the mountains is continental in climate with more extreme temps (especially winter cold) and is generally drier throughout the year which is indeed why you go from sagebrush and juniper "steppe" on the east to forest (north) and woodland/chaparral (south) on the west.
good luck with your planting there should be a number of cold hardy cacti (some of them native to our region) worth trying. believe "the desert northwest" nursery near Sequim and "cistus" near Portland both stock such things.
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