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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

Irises can become congested over time, which tends to inhibit flowering. This can be remedied by lifting and dividing their rhizomes to give them a little more space. Wait until flowering is over before dividing the iris clump, discarding any old

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