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.The flower stems are strong and tall, up to 1.2m (4ft), and each supports a single magnificent bloom, blood red and boldly imprinted at the base of each petal with a jet-black splodge. The stamens, arranged in a broad circle around the dark, central knob

foliage. Height/spread 1.2m x 90cm.Corsican hellebore, Helleborus argutifoliusDespite its name, it's not that likely to flower for Christmas - more usually seen flowering from late-winter. Flowers are white, though sometimes flushed pink, and flat

, with yellowy pink blooms. Height 110cm.Dahlia 'Preference'Large-flowered cactus type, needs staking to support stems. Height 120cm.Dahlia 'Reputation'Giant-flowered semi-cactus dahlia. Grow in rich soil for best results. Height 140cm.Dahlia 'Rev P Holien'Medium-flowered

and naturalise in borders, so any plants lost to frost should be replaced by their offspring.More features and advice on growing herbaceous perennialsLearn how to take verbena cuttingsGrow plants to attract beesChoose flowers for late-summer colour

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

combined with Phormium 'Bronze Baby' for height, along with nasturtiums and purple basil for good measure.Top container annualsCoreopsis tinctoria 'Mahogany Midget'The cottage-garden feel of these daisy-like flowers adds a sense of informality and movement

, this spreading plant features clumps of strappy leaves alongside sprays of trumpet flowers in shades of red, yellow and orange.My top plants for extending colourCrocosmiaThis plant is ideal for the no-fuss gardener. The large, long-lasting flowers in pinks