Heuchera Obsidian (Coral Bells) ground cover features dainty spikes of creamy bell-shaped flowers rising from the striking foliage from mid Spring to Summer. Glossy, maroon-black leaves, which become darker with maturity as the season progresses, adding long lasting colour to your borders and pots.
Semi-evergreen, with some of the foliage dying back in Winter, Heuchera Obsidian make a lovely low growing addition to the front of mixed beds and borders, rockeries, and woodland gardens, they also make a great container plant. Highly effective as a weed supressing ground cover carpet if planted in groups, they will provide near year-round colour with the added interest of their plume stalks of delicate flowers, loved by bees, from late Spring through to early-mid Summer (trim these flower stalks down to their base when they have gone brown, and the plant will continue to produce flowers – though with less regularity towards the end of their flowering season). Try planting with contrasting colours of other Heuchera such as Heuchera Lime Marmalade, with Rudbeckia, or under Acers with Hosta and mixed dwarf grasses, especially Liriope.
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Heuchera Obsidian ground cover are evergreen to semi-evergreen except in very harsh Winters when their leaves and foliage die back closer to ground level (although fresh new leaves will appear again the following Spring). They prefer dappled or semi-shaded locations but will withstand more direct sunlight than the paler/lighter varieties. One thing they do require is moist but well-drained soil until established, when they will tolerate drier soil. They will not thrive in soil that becomes waterlogged so add grit and well-rotted compost to clay soils before planting. To maintain them simply cut back any tatty or brown foliage from the previous year in early Spring and divide any clumps that become congested in early Spring or late Autumn.
How to grow Heuchera Obsidian
Position: Full Sun/partial shade
Foliage: Semi-evergreen, palmate shaped leaves may die back in Winter but reappear from Spring
Soil and site: Fertile, moisture retaining & well drained
Flowering time: Late Spring through to mid-late Summer
Growth rate: Moderate
Ultimate height and spread: 45cm (to 60cm when in flower) and to 30cm
Hardiness: Hardy once established
Aftercare: Water well until established, avoiding soil becoming waterlogged. Trim off any dead/straggly areas after flowering has finished. Divide clumps in early Spring or late Autumn if they become congested