Winter #JapaneseKnotweed: Stems turn brittle and brown, leaves turn brown/yellow and fall off this usually starts to occur during first frost #Knotweed #InvasiveWeeds https://t.co/7Smjej6HiwWinter #JapaneseKnotweed: Stems turn brittle and brown, leaves turn brown/yellow 3413666 Winter #JapaneseKnotweed: Stems turn brittle and brown, leaves turn brown/yellow and fall off this