There's more than enough reason to conclude that pasture weed problems
are due in major part to the way people do things nowadays. In the
past, before all farms became either animal or vegetable, pasture was
rotated with grains and row crops, and tilled and replanted. If this is
not done, it's hard to see what force keeps the weeds from taking over
altogether, since livestock are constantly selecting for weeds, the
surviving plants that aren't grazed! Fortunately in this case I just
have to give up star thistle for cut flowers.
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