Salvia 'Black Knight'
Hybrid sage
- Height × spread
- 2m × 1m
- Position
- Full sun
- Hardiness
- Mild winter to -5C (RHS H3)
- Flowers
- Summer, Autumn
Availability
Please ask in store about availability
Many plants are seasonal. Call 01234 567890 to check current stock.
About this plant
A rather tender, very beautiful salvia with exotic effect. The leaves are rich green, good-sized and tapering to a point with a crinkled surface. The flowering stalks are long and slender, green at their base and black chocolate at the tip. Black flower buds open to long funnel-shaped velvet purple flowers with open curved lips. This should flower from summer to October if deadheaded so is high-value. One of those 'must-haves' when seen. It can achieve 2 metres in height if it matures. Take cuttings in autumn, or provide a protective mulch and hope it survives the winter.
- Flower colour
- Purple
- Foliage colour
- Green
- Variegated
- No
- Scent
- No
- Shape
- Column
- Height
- 2m
- Spread
- 1m
- Height in 10 years
- 1m
- Spread in 10 years
- 0.5m
- Season of interest
- Summer, Autumn
- Flowers in
- Summer, Autumn
- Evergreen
- Deciduous
- Garden style
- Exotic garden
- Sun or shade
- Likes full sun
- Soil type
- Chalk, Loam (normal)
- Soil pH
- All types
- Drainage
- Well drained soil, Dry soil
- Hardiness
- Mild winter to -5C (RHS H3)
- Borders & containers
- Borders and containers
- Use for
- Bee attraction
- Maintenance
- Easycare – low/no maintenance
- Hazards
- No
Spring
Spring - late · Outdoors
Feed with slow release fertiliser
Apply a general purpose slow release fertiliser, spreading it around the root area of the plant as it is coming into growth. (Or apply a liquid feed at regular intervals throughout the growing season.)
This is a simple way to provide a nutrient boost as a single annual procedure.
Spring-Autumn · Outdoors
Water in dry periods
Established plants in the ground can cope with 7-10 days of dryness, and shrubs often manage 2 to 3 weeks. Water one section of the garden thoroughly each day rather than a little everywhere. Check plants in pots more often, especially in hot weather.
Spring - mid-late · Planting
Trim the plant
Trim the plant to give it a general tidy. This includes removing any lengthy or awkward shoots that make the plant look visually less attractive. Remove any spent flower heads at the same time.
Planting & general
Planting
Deadhead blooms during flowering season
Remove flowers as they turn brown and fade. Snip the stem just below the bloom. This will keep the plant tidy and encourage more flowers.
The removal of spent flowers encourages the plant to produce fresh ones, rather than spend its energy on the development of seeds.
Compost · Planting
Loam based compost + grit for repotting
Use a free draining loam based compost rather than one which has been modified to be 'moisture retentive'.
Alternatively prepare a compost using three parts of loam (John Innes no. 2 or 3) to one part of (horticultural) sand or fine (horticultural) grit.
Found in
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