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bind weed

Over the weekend, I spoke with a chemist/plant physiologist who said that
many of the difficult weeds to control, e.g. Canadian Thistle and bind
weed, must be sprayed just as they are coming to head (flower) as that is
the most active time that the plant is taking up nutrients.  Any other
time, you will knock down the plant (stems and leaves), but the total
root structure does not get wiped out.

Can anyone confirm or refute this idea?

Charles Tuttle
Columbus  OH  Z5

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