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Advancing invisibly in Rappahannock fields right now is the Canadian thistle, a prickly invader that can put out underground roots ten to twelve feet in one season, covering an area 20 feet in diameter in the space of a year. New shoots pop up from these roots, becoming fully developed plants in seven or eight weeks. After flowering, the plants also propogate by seeds which are borne on the wind to start new thistle patches where ever they fall.
So ideally adapted for survival is this weed that each piece of a root can start a new colony and each little seed can survive for years underground. The capacity to store food value is so developed in the thistle that continuous cultivation breaking up stems and roots may still not kill it. In a wheat field with a severe infestation, this pest may cause a reduction of 60 percent of the yield.
75.3%