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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

Most lily bulbs are sold in spring, although some, such as Lilium candidum, are sold in the autumn. This is a time when mould can thrive, so check them carefully when you buy to make sure there are no signs of it - an infected bulb can easily spread

or they'll fly off.At the first sign of attack, spray plants with acetamiprid or sunflower oil. Treatment is more effective on larvae than adults.lilies, fritillaries and Solomon's sealspring, summer, autumnMore common garden pestsPollen beetleFlea beetle

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

Follow Rachel de Thame's video advice on planting up a container of summer-flowering bulbs, with advice on choosing healthy bulbs, planting depths and protection from frost.springMore advice on planting bulbsLayering bulbs in a potPlanting lily

This container is proof that simple arrangements can produce dramatic results. Agapanthus plants produce beautiful sky-blue flowers on long elegant stems throughout the summer months. The plants are easy to grow and thrive in pots. Although it can

.AdamDeadhead spent flowers regularly to keep the display looking fresh.More on late-summer colourAlan Titchmarsh's tips on growing plants for late-summer colour.Provide late-summer nectar for pollinators.Grow schizostylis for late-summer colour.

single variety, planted in large drifts.In damp areas, try planting snake's head fritillary (Fritillaria meleagris), an early flowering bulb that looks stunning when naturalised in grass.Bulbs or corms, such as daffodils or crocusLawn-edging tool

seed.Planting marsh orchids in borders.Creating an exotic container display.Choose summer flowering bulbsBrowse plants by flower colour

Fill gaps in your summer planting displays with brightly-coloured lilies for a temporary, but timely, burst of colour. Plant lily bulbs into pots then simply drop them, pot and all, into arrangements on the patio, or even in your borders. Lily