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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

to grow great irises

Generate new plants from your hostas by following Monty Don's video guide to lifting, dividing and planting.spring and autumnPropagating plants by dividingIrisesHerbaceous perennialsAstersDay liliesView a selection of hosta plantsBrowse a variety

Generate new plants from your hostas by following Monty Don's video guide to lifting, dividing and planting.spring and autumnPropagating plants by dividingIrisesHerbaceous perennialsAstersDay liliesView a selection of hosta plantsBrowse a variety

.Dividing irises.Self-seeding plants.Browse a selection of Hellebore plants View plants with attractive seed heads

project.Dividing irises video project.View varieties of asterBrowse plants by flower colour

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

This is prime iris season: a few weeks when these hugely flamboyant flowers come into their own. I grow two different sorts of iris in my garden: the Siberian iris and the bearded iris. Siberian irises are smaller flowered, have thinner leaves