Heucherella Onyx
Heucherella Onyx
(x) Heucherella Onyx
Foamy Bells
She arrived fresh and in good shape, no problem acclimatizing and already very beautiful.
Magaly, 19/05/2020
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Available in 3 sizes
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This plant carries a 12 months recovery warranty
More information
We guarantee the quality of our plants for a full growing cycle, and will replace at our expense any plant that fails to recover under normal climatic and planting conditions.
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Description
With its splendid glossy foliage of almost black-purple, x Heucherella 'Onyx' is undoubtedly the darkest of the hybrids between heuchera and tiarella currently available. This beautiful new plant, of medium size, forms a dense clump of leaves, from which numerous graceful flowering stems emerge in early summer, reminiscent of those of heucheras, adorned with small white bells. Hardy and tolerant, it is an excellent perennial for partially shaded and cool areas of the garden, in light woodland. It will also make a great statement in a pot on a patio or balcony!
Heucherella 'Onyx' belongs, like its ancestors heuchera and tiarella, to the Saxifragaceae family. It has inherited the best qualities of these two plants: the spectacular foliage of heuchera and the abundant flowering and superior robustness of tiarella. It is an evergreen to semi-evergreen perennial, growing in a low and compact clump. At maturity, it reaches 25cm (10in) in height (for the foliage), 40cm (16in) in flower, and 40cm (16in) in width. The leaves measure 5 to 10cm (2 to 4in) in diameter. The leaves that emerge in spring are narrower. They give way to larger, rather round leaves, strongly lobed at the edges, with prominent veins. They are dark purple on the upper side, and purple on the underside. The lamina has a beautiful satin appearance that enhances the depth of the colour. The very long-lasting flowers appear in June-July, grouped in condensed spikes, carried by thin and hairy stems that are 40cm (16in) tall. This white flowering with tiny bells gives an impression of foam.
Heucherella 'Onyx' appreciates wooded environments with a humid atmosphere. It is less sensitive than heuchera to the combination of heat and humidity. It naturally finds its place in moist woodland alongside ferns, Impatiens balfouri, Solomon's seal, and astilbe. It is also a good border plant to surround hydrangeas and camellias, for perennial beds, or in a rockery. Keep it away from the blazing sun. It can also be used as a waterside plant. It will thrive in containers or sheltered gardens away from direct sunlight. It should be planted in well-drained compost without excessive fertilisers. Water in summer. Reduce watering in winter. Pots will need protection against cold winter winds.
Heucherella Onyx in pictures
Flowering
Foliage
Plant habit
Botanical data
(x) Heucherella
Onyx
Saxifragaceae
Foamy Bells
Cultivar or hybrid
Planting and care
Easy to maintain, 'Onyx' thrives in all types of moist to wet, well-drained soils, preferably neutral to acidic. It can be planted in partial shade or dense shade (although the foliage colour may be duller in this case). Morning sun is well tolerated, especially in moist soil. Full sun should be avoided at all costs. It should be planted in loose soil that retains moisture, with the option of adding mulch. It does not tolerate very hot conditions and appreciates high humidity. Once established, this perennial seems to tolerate dry shade under trees and bushes in the summer. It requires little maintenance and pruning is not necessary unless the foliage is damaged or you want to rejuvenate the plant.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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