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Hardy perennial
Saxifragaceae
Perennials
Heuchera 'Obsidian'
Heuchera
Heuchera 'Obsidian': 25 cm high and 40 cm spread, sun to partial shade. White flowers in June. Zone 4; choose soil compatible with its moisture needs.
- Exposure
- Sun to part shade
- Life cycle
- Hardy perennial
- Hardiness
- Zone 4
Discover the plant
Common nameHeuchera 'Obsidian'
FamilySaxifragaceae
GenusHeuchera
CultivarObsidian
TypeHardy perennial
Botanical nameHeuchera
Heuchera 'Obsidian' adds a plant with white flowers to the flowerbed. Its foliage boasts shades of black, which should be highlighted amidst different textures. The usual flowering period is in June. Its size of 25 cm by 40 cm makes it suitable for a low, front border of a bed, without forgetting space for its neighbours.
The success of Heuchera 'Obsidian' begins with its location: sun to partial shade, in suitable soil (humus-rich, retaining moisture during growth, with no standing water around the crown). For Heuchera 'Obsidian', regularly check the soil around the root ball: it should remain moist. Water at the base when the surface begins to dry and adjust watering according to rainfall; this exposure (sun to partial shade) does not eliminate the need for water. Keep 40 cm as a general spacing guideline between plants; this helps preserve their shape and allows access for care. The indicated hardiness level is zone 4, to be assessed according to your garden's conditions.
To maintain the appeal of Heuchera 'Obsidian' after flowering, remove damaged leaves without burying the crown and protect the foliage from scorching sun if the soil dries out quickly. Frost and thaw can lift the heuchera's crown; check in spring that the roots remain in good contact with the soil. For companion planting, consider perennial geraniums, daylilies, and campanulas in varieties with similar needs. The flowering period (June) and the 40 cm spread will serve as benchmarks for distributing other plants around this one.
Planting guide
From planting to establishment.
Spacing / density
15.75 in
Best planting time
Spring after the thaw or early autumn, allowing time for the roots to settle before the severe cold.
Propagation
Division of clumps. Sowing does not guarantee the fidelity of a named cultivar.
Growing method
Heuchera 'Obsidian': In spring after the thaw or in early autumn, allowing time for the roots to establish before severe cold sets in. For Heuchera 'Obsidian', regularly check the soil around the root ball: it should remain moist. Water at the base when the surface begins to dry and adjust watering based on rainfall; this exposure (sun to partial shade) does not eliminate the need for water. Freezing and thawing can lift the heuchera's crown; check in spring to ensure the roots remain well in contact with the soil.
Soil and care
The right care,at the right time.
Soil pH
Acid to neutral; general botanical group indication
Care level
Regular maintenance
Watering
For Heuchera 'Obsidian', regularly check the soil around the root ball: it must remain moist. Water at the base when the surface begins to dry and adjust watering according to rainfall; this exposure (sun to partial shade) does not eliminate the need for water.
Soil type
Humus-rich, retaining moisture during growth, with no standing water around the collar
Fertilization
Fertilizer for flowering
Moisture
Regular freshness during growth
Seasonal care
Coral bells 'Obsidian': remove damaged leaves without burying the crown and protect the foliage from scorching sun if the soil dries out quickly. During its flowering period (June), also check for damaged stems and neighboring plants that might obscure the clump.
Container growing
A garden,within reach.
Recommended pot size
Stable, perforated container, significantly wider than the root ball; size to be adapted to the format sold and adult development.
To try Heuchera 'Obsidian' in a container, choose a stable pot with drainage holes, suited to the root ball and its future size (40 cm). The substrate must remain moist; it will dry out more quickly than if planted in the ground. Plan to protect the container in winter depending on your climate.
Bloom and dimensions
Its place,in your garden.
Mature height
12 inches (30.5 cm)
Width / spread
16 inches (40.5 cm)
Flower color
White
Foliage color
Black
Foliage type
Persistent to semi-persistent depending on the climate and winter conditions
Growth rate
Moderate
Growth habit
In rosette
Fragrance
Undocumented for this selection
Bloom period
June
Garden associations
In goodcompany.
Companion plants
Associations to consider for Heuchera ‘Obsidian’: perennial geraniums, daylilies, bellflowers. Choose varieties that tolerate sun to partial shade and comparable moisture; allow each clump enough space to reach its mature size.
Plants to avoid
Around Heuchera 'Obsidian', especially avoid neighboring plants that would cover its leaves or strongly compete with its root ball. Compatibility in terms of light, water, and size takes precedence over a list of so-called enemy plants.
Frequently asked questions
Your questions,answered.
Where to plant Heuchera 'Obsidian'?
Provide partial shade to full sun and well-drained soil (humus-rich, moisture-retentive during growth, without standing water around the crown). Freezing and thawing can lift the crown of the heuchera; check in spring to ensure the roots remain in contact with the soil.
Where should Heuchera 'Obsidian' be planted?
Expect a height of around 25 cm and a width of 40 cm at maturity. Allow about 40 cm between centers, to be adjusted according to the actual development of the clump. This size is suitable for use as a low border at the front of a bed.
When does Heuchera 'Obsidian' bloom?
The period indicated is June. The flower color is white. The exact date and duration depend on the climate, season, and plant establishment.
How to water and care for Heuchera 'Obsidian'?
For Heuchera 'Obsidian', regularly check the soil around the root ball: it must remain moist. Water at the base when the surface begins to dry out and adjust watering according to rainfall; this exposure (sun to partial shade) does not eliminate the need for water. Remove damaged leaves without burying the crown and protect the foliage from scorching sun if the soil dries out quickly.
Can 'Obsidian' Heuchera be grown in a pot?
To try Heuchera ‘Obsidian’ in a container, choose a stable pot with drainage holes, suitable for the root ball and its future size (40 cm). The substrate must remain moist; it will dry out more quickly than in the open ground. Plan to protect the container in winter depending on your climate.
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