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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

it facing upwards. Cover with compost. Position somewhere cold and dark and check regularly for watering and pests. Once leaves appear in 10-12 weeks, bring the bulbs into the house.AdamTry forcing other spring bulbs, such as Narcissus 'Hugh Town', 'Itzim

Learn how to plant colchicums, and pick up advice on soil enrichment, drainage and corm planting depth, in Chris Bearshaw's video guide.summerMore advice on plantingHow to plant in wavesGrowing dahlias from seedBrowse a variety of crocuses

are growing stronglyMore on growing summer perennialsHow to grow climbing glory vinePlant summer-flowering bulbs in potsGrow dahlias for cut flowersGrow exotic plants from seedGrow lilies from bulbilsPlant eucomis

Learn how to plant out marsh orchids, with Carol Klein's video demonstration from the Jungle garden at Berryfields.springMore advice on growing exotic plantsCaring for cannas video project.Growing exotic plants from seed.Planting eucomis bulbs

, 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

Follow Joe Swift's video guide to planting, training and pruning passion flowers.summerMore about growing climbing plantsPlanting a clematis, with advice from Sarah RavenCreating a rustic trellisUsing plant supports

.AdamAfter planting, keep the hyacinth bulbs moist during the growing season and they should reward you with flowers over a long period of time.When buying bulbs to plant outdoors, avoid those that have been specially treated to flower indoors at Christmas.More bulb

Verbena bonariensisVerbena bonariensis flowers on tall, wiry stems and can be planted with a variety of different perennials, including grasses. It has a long flowering season, making it an ideal plant for low-maintenance gardens and herbaceous