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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

on growing bulbsPlanting summer bulbs in a container.Growing agapanthus from bulbs.Creating a colourful container display of daffodils.Planting iris bulbs.

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

1) A plant or shrub pruned and trained to grow into a tree-like form, with one trunk or stem that's 3-6ft long before branches appear. The practice is entirely aesthetic, and often used for roses. See Half standard.2) The erect petals of the iris

flowerheads in summer. It will perform equally well in a sunny border or a container.Jarava ichuThis easy-to-grow bearded iris, with butter yellow and lavender petals, will flower from late-May to mid-June.Iris 'Lullaby of Spring'This short, smoky yellow iris

that will flower at different times.Deep potCompostLarge-flowered daffodilsTulipsDwarf bulbs, such as crocus or irisSeptember - October45 minutesMarch - AprilFill the base of the pot with compost and plant a layer of large-flowered daffodils on top. Cover with a

This fungal problem results in rounded spots on the leaves. Although it's unsightly, leaf spot is only a significant problem on poorly growing or unhealthy plants, which might end up dropping a substantial number of leaves.A fungal attack causes

.Promptly pick off and destroy affected leaves. If leaf spot is a persistent problem, try growing your primulas under glass.Spraying with myclobutanil may help give some control, although they're not specifically labelled as a solution for primula leaf spot

pull them out if they appear in the garden. Every two weeks from early spring onwards spray plants with a systemic action fungicide.hollyhocks, mallowall year roundCommon fungal problems affecting plantsIris leaf spotRose blackspotRose rustTulip fire