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Spores carried by water and wind spread this fungus, which leaves primula foliage peppered with holes. The initial signs are spots in a yellow-orange area, or in grey, papery tissue. When the centre falls out, holes appear. Look beneath the leaves and there may also be white fung...

Follow Chris Beardshaw's step-by-step video advice on lifting and preparing dahlia tubers, for overwintering in a frost-free environment.autumnMore advice on growing dahliasVideo advice on planting dahlia tubersMore tips on lifting and storing dahliasHow to take dahlia cuttingsHo...

Sarah Raven demonstrates how to plant up dahlia tubers in trays indoors, to ensure a greater number of cuttings in summer.springMore advice on growing dahliasLift and store dahliasGrowing dahlias from seedTie in dahliasTaking dahlia cuttings video projectBrowse a variety of dahli...

Sarah Raven shows how to take cuttings from dahlia plants in her step-by-step video guide. She also gives a demonstration on how to make a simple propagation tent from a plastic bag, stakes and an elastic band.spring and summerMore advice on growing dahliasLift and store dahliasG...

Learn environmentally friendly methods for controlling aphids, and other garden pests with Monty's guide to organic insecticides and how they work. Monty also talks you through how to make your own, organic pesticide.summerAdvice on aphids and other garden pestsAphidsMealybugsWhi...

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...

. Dahlia plantSticks or canesStringJune - August15 minutesJuly - SeptemberCheck dahlias each week; if they're starting to flop tie the main stem to a supporting cane or stick with garden string. Don't tie the string too loosely, but allow a little room

Sarah Raven offers video advice on planting eucomis bulbs in a pot, including information on drainage, compost and planting depths.springMore advice on growing exotic plantsCaring for cannas video project with Carol Klein.Growing exotic plants from seed.Planting marsh orchids in ...

: granular, liquid, powder, or organic manureWatering can (for liquid application)Spade or fork (for digging in manure)March - August20 minutesWell-rotted horse and cattle manure contains plenty of nutrients for plants. It can be added before planting or used

.Verbena plantsSharp knife10cm potsFree-draining compost (multi-purpose and perlite mix - see Adam's tip)Rooting hormone (liquid or powder)Clear polythene bags and rubber bandsJuly - September45 minutesTake cuttings in the morning when shoots are at their firmest