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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

- and will not survive repeated cutting or pulling.Use a weedkiller such as glyphosate. Spray directly onto the plant and avoid spraying on a windy day and near other desirable plants.all over the gardenearly spring to autumnMore advice on removing weeds

already started to grow around other plants, untwine it, lay it on bare ground and then spray it. Avoid using the weedkiller on a windy day and near desirable plants. all over the gardenearly spring to autumnMore advice on removing weedsGround elder

as an excellent green manure when dug back into the soil. In lawns, use a weedkiller such as a 2, 4-D-based herbicide in spring or early summer, when growth is at its most vigorous. Repeat throughout summer where necessary. Apply in cool, moist, calm conditions

-white roots of ground elder. Regular cutting of the foliage, just below ground level with a hoe will gradually weaken the plant, but this needs to be done every 7-10 days, as soon as regrowth appears. Alternatively, fork through the soil every 10 to 14 days

Left unchecked, hairy bitter cress can quickly spread to infest the whole garden. This weed can complete its lifecycle in three to four weeks to disperse thousands of seeds, all of which can germinate to release their own seeds in quick succession

Field horsetail is also known as marestail. Once established, it has roots that extend to 2m deep, and spreads by means of creeping rhizomes. The plant produces light-brown stems in late spring, topped with cone-like structures

it out effectively, but you can hold it at bay by keeping the lawn healthy and thereby making conditions less favourable for the yarrow. Top-dress the lawn in spring and in September, mow it regularly and lightly rake when in growth to weaken the weed