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Willowherb, or fireweed, Chamerion angustifolium, is a pretty plant that looks at home in a wild garden, but will take over any domestic garden, spreading by seed and tough underground roots. Left unchecked, it will invade the space of other plants

in from surrounding gardens, fields and waste ground.A bushy weed that bears small yellow flowers and fluffy seedheads. Its leaves often have orange-brown pustules of rust fungus in summer and autumn, which can spread to cultivated plants. Pull out young

. all over the garden, but particularly in lawnslate-spring to autumnMore advice on removing weedsDockWillowherbMeadowgrassCouch grass

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

such as rosebay willowherb or marsh bedstraw. Do not kill them because they go on to form one of the UK's most beautiful moth residents. If leaf damage is minimal, action isn't necessary.fuchsias, wildflowers including rosebay willowherbmid- to late

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