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, woody rhizomes and replanting only young, healthy plants into freshly-prepared soil. IrisesGarden forkSharp knifeTrowelJuly - August30 minutesUse a fork to dig up a congested clump of irises. Ease the plants from the soil, taking care not to spike

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

into the soil in the garden.More advice on growing rosesSarah Raven's guide to planting rosesPlanting a rambling rose against a tree, with advice from Chris BeardshawPruning a rose bush.Planting a bare-root rose

with gritty loam-based compost and sow the seeds evenly across the surface.Sprinkle a layer of compost over the seeds, water, then stand the pot in a cold frame or sheltered place in the garden. Keep it watered and protect it from birds.AdamMake sure berries

and shape of its flowers.The day before you intend to pollinate your plant, cut at least one fully open flower from the father plant, making sure it has 2.5cm (1in) of stem. Bring this flower into the house and float it in a shallow bowl of water overnight

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

boardPotsFree-draining compost, equal parts multi-purpose and perliteClear polythene bagsJune - September1 hourRemove a healthy leaf, lay it on the cutting board and, using a clean, sharp knife, cut it into pieces the size of a large stamp. Each portion

and overwinter them in a coldframe.Keep the cuttings watered and shoots should start to appear next spring. Leave plants for at least 12 months before transplanting.AdamRemove a 1-2cm sliver of bark from the base of any variety that is shy of rooting, e