Dig it out repeatedly and you may get rid of it after a few years.
How long does Japanese Knotweed take to grow?
These estimates for how long Japanese Knotweed takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.
Days to Germination How long does it take Japanese Knotweed to germinate?
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Days to Transplant How long until I can plant out Japanese Knotweed?
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Days to Maturity How long until Japanese Knotweed is ready for harvest / bloom?
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Total Growing Days How long does it take to grow Japanese Knotweed?