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| Helleborus | Common name; Hellebore |
hybrid
niger
These plants do well on most soils, including heavy clays and chalk, but to ensure drainage is good, bulk up poor sandy soils with well-rotted organic materials such as garden compost or farmyard manure.
In spring, cut off all the leaves to ground level, leaving the flowers, and apply an annual mulch of well-rotted manure.
Exposing the flowers in this manner, will assist pollination, and thereby encourage good seed-setting.
Plants are harmful if eaten!
Week 13; Divide or move plants if weather and ground conditions allow, and re-plant immediately.
Established hellebores, resent root disturbance, so when moving them, try to keep the rootball as large as possible, otherwise you may suffer a loss of blooms next year.
When crowns are divided up to increase plant numbers, be prepared for little or no flowers for a year or two.
Seedlings that have grown around established plants can be forked up when a few inches tall and potted up or transplanted to a nursery bed.
These may take two to three years to reach flowering size.
Week 14; Collect seed when fresh and ripe, and sow immediately.
Germinate for 6 weeks at around 24°C (75°F), then transfer to a shaded coldframe, the cooler the better, for another 6 weeks.
Prick out seedlings when large enough to handle into boxes or 70mm (3”) pots, place in a cold frame or nursery bed, and grow on until planting out time.
Seed sown plants can take up to three years to flower.
Week 26; Sow commercially purchased seed in trays of a 50-50 mix of compost and sharp sand and place in cold frame to germinate
Germinate for 6 weeks at around 24°C (75°F), then transfer to a shaded coldframe, the cooler the better, for another 6 weeks.
Week 33; Prick out seedlings when large enough to handle into boxes or 70mm (3”) pots, place in a cold frame or nursery bed, and grow on until planting out time.
Seed sown plants can take up to three years to flower, and wont come true to the parent plant..
Week 40; Plant 300mm (12") apart during October in a shaded or dappled shaded spot.
The root ball should be inserted about 25mm (1") below the surface of deep, well-drained, moist soil.
Pests & Diseases;
Hellebores are generally trouble free but in recent years some of the hybrids have been affected by various fungal diseases and viruses, e.g. Fungal leaf spot, Cucumber mosaic virus, Helleborus net necrosis virus.Fungal leaf spot; As the name suggests is caused by a fungus that causes brown eliptical blotches to appear on both sides of the leaves. Lesions can sometimes appear on the stems sometimes causing the to shrivel and collapse.
The best cure is to remove all the affected parts, if the problem is only slight using a fungicide can sometimes help.
Cucumber mosaic virus is transmitted by aphids and causes yellow to white line patterns to appear on the leaves.
As with all virus problems, destroy the infected plant/s immediately to reduce the risk of spread.
Click here to see treatment for Helleborus net necrosis virus
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