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based on sulphate of iron. When the moss has blackened (after two or three weeks), use a spring-tine rake to remove it. Apply it in calm conditions when there is least risk of accidentally damaging nearby garden plants.all over the garden

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

Speedwell (Veronica spp) is an annual weed that spreads through lawns and borders, and has attractive tiny blue flowers. It spreads by seed in spring and autumn to form plants with strong tap roots. Speedwell appears in lawns as individual plants

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

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

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

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 bindweed

. Couch also produces flowerheads that are followed by seeds, allowing the further spread of this weed.Couch grass spreads easily to form dense mats of underground stems. It grows among cultivated plants, competing for water and nutrients and reducing crop

, as it prevents them from flowering and setting seed. Use a total weedkiller, such as glyphosate, spraying directly on to the plant. Avoid spraying on a windy day and near other desirable garden plants. all over the gardenearly spring to autumnMore advice

Fat hen, Chenopodium album, is an annual weed loved by butterflies, and whose young leaves are delicious in salads or cooked like spinach. However, it will also quickly colonise open ground and spread through your garden if left unchecked - a single