by now you’ve probably already discovered that Japanese knotweed does not go quickly or easily. a stand like yours will require persistence, determination and brutality. according to some sources, your best chance for eradicating it is almost upon us: in late july, early august it gets ready to bloom. cut it down to about 6-12 inches and then spray with roundup (apologies to green folks out there – i did say brutality). it will probably take you two to three seasons to kill it completely. frankly, i put JK in the same category as roaches: it will spread around the earth long after we’re gone. – phil
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.