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of gritty, well-drained compost and keep in a cold greenhouse. Height 10cm.Tecophilaea cyanocrocusAs a species, Ipheion uniflorum can look a bit wishy-washy, but 'Wisley Blue' is very pretty. Its flowers are like big, upward-facing blue stars. Plant it among

Climbing flamesAs summer progresses, late-flowering clematis come into their own, and for me they're as much a part of summer as long, balmy evenings and cricket.There are few plants that give me as much pleasure or colour for so little work as late-flowering

New plants at Chelsea 2008The plant marquee is packed with new, and often awe-inspiring cultivars. Here are some of our favourites from this year's show.Jarava ichu, or Peruvian feather grass, forms mounds of bright green foliage with showy, silver

coloured white, pink, green, mauve or smoky purple. Blooms may be plain or patterned. Plants will self-seed readily. Height/spread 45cm x 30cm.Lenten rose, Helleborus x hybridusProduces pendent, bowl-shaped, green flowers set against spiny, evergreen

level will rejuvenate it and, though it seems brutal, will allow the plant a fresh start. Once again there will be neat rosettes and, with luck,a few more flowers in late summer. More on growing ornamental poppiesMake a nettle feed in a container

pretty display for the Christmas table. In colder situations it will flower prolifically until the first frosts, then bloom intermittently in warmer spells until the end of the year.Dig in plenty of organic matter before planting the bulbs and water them

staking than other varieties, which tend to have dense, heavy heads of petals.Cactus dahlias are perfect for providing extra colour to herbaceous borders, as they have such a long flowering season. They also come in a rangeof heights, so can be planted

flowering times:10 best varietiesIf planted in a sheltered, south-facing spot, 'Rijnveld's Early Sensation' will be in flower by Christmas. While most daffodils in bloom at this time of year are usually small, this variety has large, windmill-style flowers

, while the falls are pure white with narrow, pale-violet edges. Mid-season flowering, from May to June, height 80cm.Iris 'Dancer's Veil'An intermediate bearded iris, suitable for planting on slopes or in windy areas. The standard and fall petals

all summer long. Support them, feed and water them regularly, remove spent flowers and watch out for signs of pests and diseases. Our five tips, below, will ensure your roses put on a show-stopping display.Deadhead roses regularly, otherwise plants