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cactus dahlia, with sunny yellow flowers. Height 120cm.Dahlia 'Yellow Galator'Small-flowered semi-cactus type, with white-tipped pinky red petals. Height 60cm.Dahlia 'Pianella'More about using garden weedsTake dahlia cuttings Plant dahlia tubers

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

Field bindweed, Convolvulus arvensis, is a pretty, white-flowering climber loved by butterflies. However, it's a pernicious weed that will smother anything in its path, and will quickly take over beds, borders, walls and fences unless kept in check

to use in winter. Cut down the leaves to stimulate new growthOrder garlic ready for planting in autumnWater pot cyclamen saved from last year to start them back into growthBuy prepared hyacinth bulbs and plant as soon as possible so you get flowers

.Acer griseum, Paper-bark maplePrunus serrula is perfect tree for small gardens. It provides year-round interest, producing small, white flowers in spring, followed by small fruits and red or yellow leaves in autumn. Its shiny bark remains a deep red throughout

There are several different viruses that affect tulips, each with slightly different symptoms. Tulip breaking virus causes streaking or marking of purple, pink and red tulips, usually on the late-flowering cultivars. White and yellow tulips aren

For a short but glorious time in June oriental poppies come into their own, providing flamboyant displays to enliven borders, says Carol Klein.Most gardeners yearn for a splash of glamour, and the most flamboyant of all June's flowers has

Clover, most commonly Trifolium repens, is a perennial weed with shamrock-like leaves and fragrant white flowers. It colonises gardens and lawns using runners that fix into the ground, and competes with other plants for space to grow. Once it

's not confirmed how the virus is spread, but sap-sucking insects, nematodes and gardening tools, such as pruning knives, are likely contenders.Canna leaves develop pale spots and streaks, as well as a distorted, crinkly look, while flowers may also become

, and can be picked off by hand.The moment you spot an infestation, spray them with pyrethrum. If the plants are in flower, spray in the evening, so pollinating insects aren't affected.verbascum, buddleia, figwortsmid-spring to midsummerMore advice