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[Bill Jones <billj AT harborside.com>]

Yesterday I discovered Japanese knotweed.  It has the softest stem for 
cutting, and one stalk grows to be huge!  Today I researched it some 
online.  It's not invasive in clay soil, nor does it sprout from seed in 
the north, or without pollination from a separate male plant.  It's said 
to be capable to producing 25 kg of biomass to the square meter, of 
about 5 pounds to the square foot!

Bill
S. Oregon coast