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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

, 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

A fungal disease weakens the plant and can seriously reduce its flowering performance. The brown spots eventually grow together and develop grey centres. Infection is caused by air or water-borne spores entering the plant through damaged leaves