Must have been a heck of a drought, grapes have deep tap roots and are
often grown water stressed, intentionally, to keep the berries small.
The grapes of the Italian Piedmont area are Vitis venifera: Muscat,
Nebbiolo, Barbera, Dolcetto. Piemonte, Italy is surrounded by mountains.
It has hot summers, foggy autumns and cold winters plus calcareous marl
and sandstone soils.
I'd pick a Vitis labrusca for the south eastern U.S. As I said earlier,
with venifera in high humidity you will be battling mold and mildew
constantly. Even then, an arbor would shade the leaves (encouraging mold
and mildew). Most everywhere now, the training of the vines is allow the
maximum of sunlight and breeze to penetrate the vine to reduce the
occurrence of mold and mildew.
To my mind, the arbor isn't so much for shade, as it is to get you out
of the world of vinyl, plastic, and steel, and put you back into contact
with with the natural world of soil, plants, smells, colors, and just
maybe, the miracle of life.
Nothing, except that they are vulnerable to magpie moth (Abraxas
grossulariata) caterpillars and the best method for removing them is to
remove the larvae by hand soon after they hatch.
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