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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

Joe Swift's video guide to growing tomatoes from seedMonty Don's advice on growing tomatoes in pots and grow bagsMethods for controlling tomato blightDealing with tomato leaf mouldProtect tomatoes from frost damageHow to grow tomatoes in a greenhouse

The culprit is Trionymus diminutus, a 4mm sap-feeding mealybug that breeds relentlessly when the weather is warm and isn't killed by winter frosts. It deposits a white, waxy substance at the base of the sheathed phormium leaves. A mild infestation

hot spells and provide shading. Promptly pick off any split tomatoes before they start to rot.tomatoessummer to autumnCommon problems affecting tomatoesTomato leaf mouldTomato blightTomato frost damageBlossom end rot

weedsSpread a layer of compost over borders, around shrubs and along the base of hedgesProtect gunnera from hard frost by covering with straw or similar insulationThin out the top growth on standard roses to prevent damage and wind rockTake hardwood

Plant out tender summer-bedding plants, such as begonias, once all risk of frost has passedLook out for aphids on lupins, and spray with a soap-based insecticide if infectedPush canes into pots of tall-growing lilies and tie their stems

seed mixed with compost on to lawns to thicken growthPrune suckers away from around the base of ornamental treesProtect large ceramic or glazed pots from frost damage by wrapping them in bubble polytheneOrder bare-rooted roses for planting in autumn

Check greenhouse heaters are working efficiently Bring aeoniums and other tender plants under cover before they get frostedClear out exhausted crops and wash down glazing, staging and frameworkFinish planting paperwhite narcissi and prepared

Clear fallen leaves from greenhouse gutters Bring tender plants under cover before frosts strikeWash off any remaining summer shading paint and clean glass inside and outInsulate the greenhouse with bubble polytheneOpen vents on warm days but close

Move worm compost bins under cover for winterEmpty glazed and ceramic pots that aren't frost-proof and move under coverOrder loads of farmyard manure or mushroom compost to use over winterCut down marginal plants surrounding pondsCheck piles