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Valerian, Centranthus ruber, is a pretty plant that produces bright pink-red, fragrant flowers from late-spring to late-summer, but it also produces masses of seed that germinates all over the garden. Butterflies love it, so if you want to encourage

on removing weedsValerianPineapple weedJapanese knotweedGround elder

.established flowerbeds, freshly dug soil, cracks in paving, lawnsspring, summer, autumnMore advice on removing weedsWillowherbDockCouch grassValerian

and spray again if needed. Check again in spring. It can take 3 or 4 seasons to eradicate using glyphosate. Avoid spraying on a windy day and near other desirable plants. all over the gardenearly spring to autumnMore advice on removing weedsField bindweedValerian