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from time to time is to lift and divide our plants. Large, congested clumps need gently lifting completely, like with my hardy geraniums, hostas, phlox, campanula and others.Healthy, young outer portions can be teased or cut away to be replanted

things, the growth rate will be very different depending on the situation - for example a plant in Aberdeen will never reach the height and breadth of its twin in Cornwall.So which bamboo should you choose?Bamboos can be divided into lectomorphs (which do

, gritty compost. They take up to three months to germinate at about 15°C and should be left for a few years before transplanting and growing on.PropagationMore plants to grow for late-summer colourChoose flowers for late-summer colourCombine asters, sedums

Follow Rachel de Thame's video advice on planting irises, with tips on drainage, positioning and when to divide them.summerMore advice on growing irisesDividing irisesCreating an iris container displayDealing with iris leaf spotLayering bulbs in a

30cm (12in) or more.This aquatic perennial should be divided annually to maintain the striking green and white horizontal variegation of its foliage. When dividing only replant the most vigorous sections. Plant with 5cm (2in) of water above the crown

the hole 10cm - 15cm deep and place the bulbs at the base of the hole. Fill around the bulbs with soil taken from the hole, ensuring that some of the leaf is above the surface.AdamDon't remove the leaves from your snowdrop bulbs. Leave them to die down

as they grow.AdamPlant lily bulbs into terracotta pots, which are more stable in displays.Feed the lilies weekly in summer with a liquid plant food.More advice for growing liliesWatch Chris Beardshaw dividing day lilies in his video project.Dealing with lily

foliage. Height/spread 1.2m x 90cm.Corsican hellebore, Helleborus argutifoliusDespite its name, it's not that likely to flower for Christmas - more usually seen flowering from late-winter. Flowers are white, though sometimes flushed pink, and flat

So many of my favourite plants come from South Africa, a place that certainly feeds my appetite for bulbs. Moving on from the summer delights of agapanthus, gladioli, eucomis, galtonia, crocosmia and a host of others, I enter autumn with pots

better against a pale background - the darker varieties in particular get a bit lost against the naked soil of February.These irises are terribly easy to grow: plant the bulbs in autumn at about twice their own depth and wait. Clumps can be divided