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potato varieties if disease has been a problem in recent yearsLift and divide old clumps of rhubarb

Tie in shoots of clematis and climbers to trellis and supportsPlant out chrysanthemums for autumn flowersPrune overgrown Clematis montana after flowering, cutting lanky growth back hard to promote new shoots from the baseLift and divide congested

Deadhead winter-flowering pansies and bedding plants, and pick off damaged leavesDivide congested herbaceous perennialsPrune winter jasmine to cut back flowered shootsTransplant shrubs growing in the wrong place while they're dormantPlant lily

Prune back shoots on mophead and lacecap hydrangeas to a pair of budsTrim all foliage from barrenwort (Epimedium) before flowers start to developPlant lilies in potsPrune mahonia, removing old stems to make room for new growthLift and divide

at a pond margin. It can be divided or grown from seed in spring.Myosotis scorpioidesThis miniature water lily spreads about 30cm (12in), with each flower and leaf being just 2.5cm (1in) in size. Given a sunny position it will flower from June

Carol Klein explains how to hand-pollinate hellebores and guides you through the process, offering practical tips and advice.springMore advice on propagating plantsCarol Klein demonstrates how to cross-pollinate daffodils.Collecting allium seeds.Dividing

unwanted suckers growing around the base of trees and shrubsLift large waterlilies from ponds, divide and replant themClean pond pumps and filters, and make sure they are working properlyHand weed alpine and rock gardens

Prune gooseberry bushesFork over vacant beds, mixing in compost or well-rotted manurePlant fruit trees trained as cordons, fans or espaliers to make use of limited spaceTie in raspberry and blackberry canes to support wiresLift and divide congested

hardy annuals in late March and into April, digging over, weeding and enriching the soilLift and divide congested border plantsPlant out lilies to fill gaps in borders, or grow them on in pots Trim winter-flowering heathers

of the stem.About 15cm from the shoot tip, make a nick using a sharp knife on the underside of the branch - aim to cut just halfway through the stem. Dust the area with hormone rooting powder.Dig a shallow hole at the point where the stem touches the ground