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Couch grass often grows in among cultivated plants. It's a clump-forming perennial that spreads through the soil via underground stems or stolons, and is easily spread by cultivation. It can creep from lawns to infest flower and vegetable beds

die down to tough yellow roots in autumn, over-wintering to grow up again the following spring.Tall-growing perennial plant which spreads below ground by rhizomes or across the surface by creeping stems or stolons to form dense clumps of stinging

. freshly-cultivated ground, established borders, undisturbed ground, old walls, cracks in paving spring, summer, autumn, winterMore advice on removing weedsPineapple weedField bindweedCreeping thistleJapanese knotweed

Dock, Rumex crispus, appears in the garden in large spreading groups, and is characterised by coarse, battered leaves. It spreads via seed produced by tiny brownish-green flowers, which appear in abundance in summer and are loved by seed

or ruining your display, it might not be worth fighting it. This grass can make itself at home all around the garden, particularly in beds, borders, the lawn and paving. It has fluffy flowerheads that disperse seed and keep the weed coming.Use a handfork

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

large clumps of foliage, obscuring and smothering small plants. Seed is produced following the cream-white trumpet flowers, which also allows this weed to spread.This climbing, twining perennial dies down in winter but grows rapidly in spring and summer

. This vigorous, spreading perennial is rampant, growing over cultivated plants and making them compete for light, water and nutrients. In existing flowerbeds, it's best tackled by digging up the cultivated plants and washing their roots to tease out the cream

lawn weedkiller or a lawn feed and weed product.established flowerbeds, cracks in paving, garden walls, lawnsspring, summer, autumnMore advice on removing weedsGroundselMeadowgrassCloverDandelion

Vinca major or periwinkle is a pretty, low-growing plant often with pale blue flowers that is used as a ground cover plant because of its mat-forming properties. However, it can be very invasive, and will rapidly spread around the garden