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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

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

Arisaema speciosum is an unusual perennial from the eastern Himalayas. It grows from fat, knobbly tubers, which are best planted singly in large pots for stability.You will probably find a shoot already emerging from one end of the rhizome, so plant

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

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

Hyacinth bulbs are widely available and will produce a broad spectrum of colours. Whatever their shade, hyacinths look spectacular planted on their own in a rustic terracotta pot. It's a quick and easy job for autumn that will have stunning rewards

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

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

, 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