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At this time of year dahlias are producing stunning showy flowers, but they lose impact if the stems flop forward under the weight of the flowers. To get the best dahlia floral display, tie their stems to canes as they grow to give them some support. Dahlia plantSticks or canesS...

The winding trails on leaves are caused by the larvae of a small, dark fly. During summer, the females make little nicks in the leaf surface to lay their eggs. A week later, these hatch into larvae, which tunnel along just under the leaf surface to feed. After 2-3 weeks, the larv...

Although, in some areas, dahlia tubers have survived the recent mild winters outside, it's well worth lifting and storing them. Discover how you can ensure a bumper crop of dahlias for next summer, whatever the weather.SecateursGarden forkDry compostStorage box or containerautum...

The large, beautiful caterpillar larvae of the elephant hawk moth has two pairs of eye markings, which are made even more prominent when it withdraws its head into its body. They are, typically, a blackish-brown colour but are sometimes green, and though their 'eyes' make them lo...

The culprit is the flea beetle, which, like its namesake, jumps away when disturbed. The small, shiny, black, brown or blue beetles emerge in April and May, after winter hibernation, ready to start feeding. Eggs laid near host plants hatch in late-summer. The beetles feed for a f...

Summer is the ideal time to take verbena cuttings. Overwinter the semi-hardy perennials in a frost-free place and you'll have a fresh, healthy supply of verbena plants next year to replace any in the garden that have been killed by frost.Verbena plantsSharp knife10cm potsFree-dra...

In those wonderful James Herriot stories, there is a woman called Mrs Pumphrey, whose spoilt dog is known as  ‘flop-bot’. With a name like that, there is no need for a description. When a tray of seedlings suffers with the horticultural equivalent, and the whole lot keels over in...

Carol Klein demonstrates how to cut back ornamental grasses in spring, with tips on different methods for dealing with evergreen and deciduous species.springMore on grassesOrnamental grasses from the RHS Chelsea Flower ShowPlant profile of feather reed grass, Calamagrostis x acut...

Find out how to combine annuals and perennials of varying heights in a 'wave' planting, in this practical video guide from Carol Klein.springMore planting advicePlant a bare-root rosePlant a shrubPlant a bare-root treePlant a fig tree

Bedding geraniums are actually members of the genus Pelargonium. Many varieties of pelargonium are used as bedding or house plants.Unlike most annual bedding plants, geraniums are easily propagated by cuttings, so you don't have to fork out for more