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Re: Cork oak - Quercus suber

Tim,

Several cork oaks were planted as street trees on the Oregon State
University campus in Corvallis, Oregon, about 4-5 years ago.  This is a
USDA Zone 7 site with a humid-Mediterranean climate.  80-90 percent of
rainfall [averaging about 40 inches/110 cm] falls between October and
April, extreme temperatures have been from - 7 F [-22 C] to 107 [42 C].
During the time the trees have been in we've had very mild winters, so the
trees have been exposed to, perhaps, 15 F [-10 C].

The trees are planted in lawn and get some supplemental water in the
summer, but have at least 6 weeks aof quite dry conditions at summer's
end.

The oaks grew very little for the first couple years.  Several have had an
obvious  growth spurt perhaps 6-8 inches [15-20 cm] per year, with great
thickening of the bark. Aside from vandalism, the trees appear very
healthy -- I'd guess that the mild conditions, with VERY wet winters have
contributed to the growth.

I'd guess that you would have very similar conditions on the long range to
one of our "mild cycles", and that the cork oaks would grow much faster
for you than in their native range.

loren russell, corvallis, oregon
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