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I've also wondered why the plants don't get burned,
but they don't.
My semi erect blackberries are on a metal trellis
made out of shiny galvanized pipe (the kind used for chain link) and
wire. The top lateral support is also made out of a continuous
galvanized pipe. On hot sunny summer days, it gets so hot, I think
it might blister your skin if you touched it long enough. I
tie the canes to the top pipe just as I do to the wires with no detrimental
effect to the canes.
I've also grown a grapevine on the top of a chain
link fence. Mind you, it's not the best trellis in the world, but I saw no
adverse effects from training the grapes to the top pipe.
Mark
KS
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