Dahlia 'Honka Black'
syn. Dahlia 'Verrone's Obsidian'
Orders placed before 1 March 2025
You can expect your order in February/March 2025
Orders placed 1 March - 15 April 2025
You can expect your order in March/April 2025
Orders placed 16 April - 15 May 2025
You can expect your order within 10 business days
UK orders over £50
Free shipping
UK orders under £50
£4.99
Northern Ireland orders under £50
£5.99
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Description
If you’re a lover of all that is unusual, Dahlia 'Honka Black', (also known as Dahlia 'Verrone’s Obsidian') are going to be on your wish list. Are they black? Well, not quite, but they’re such a deep red that they’re almost black! But Dahlia 'Honka Black's charm extends beyond the colour of its petals. The unusual flower form is a definite attraction. It’s as if your garden were suddenly adorned with a constellation of black stars with brightly contrasting yellow centres.
With a maximum height of only 60-70 cm, Dahlia 'Honka Black' is easy to find space for in almost any sunny garden, and it lends itself well to being grown in containers too. Contrast it with white flowering plants or let your black dahlias have a bed all to themselves.
Gracy's gardening tip:
"Remember – it’s easy to save your dahlia tubers for replanting next year, and the year after, and the year after that."
Key features
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Good for cutting
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Comes back every year
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Attractive to wildlife
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Loved by pollinators
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Thrives well in full sun
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Packed in paper bags
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Low maintenance
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RHS Award (AGM)
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May need winter cover
Specs & details
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Botanical name
Dahlia 'Honka Black'
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Flower colour
Near-black
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Tuber size
1
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Established height
70cm-1m
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Established spread
30-50cm
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Plant spacing
5 tubers per m2
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Leaf colour
Green
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Habit
Upright
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Life cycle
Perennial
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Hardiness
Half hardy
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Years to establish
1st year
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Sunlight
Full sun
Partial shade -
Position
Sheltered
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Suitable for
Large containers
Borders
Gravel gardens
Coastal gardens
Cottage gardens
Low maintenance gardens
Cut flower Gardens
Wildlife gardens -
Soil acidity
Any
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Soil moisture
Free draining
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Soil type
Loam
Sandy
Multipurpose compost
Loam-based compost -
RHS Award (AGM)
Yes
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Growing skill
Easy to grow
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Scented
No
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Pollinator-friendly
Yes
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Mouse resistant
No
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Rabbit resistant
No
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Deer resistant
No
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Toxicity
No report
Plant calendar
| Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
- Planting
- Flowering
Useful information
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Dahlia 'Honka Black' is half hardy, which means that it should be kept frost free over winter and during spring.
For best results, start your dahlia tubers in temporary pots in a
greenhouse in March or April to grow on to transplant outside later in the season—this will give them a head start.Alternatively, you can plant the Dahlia 'Honka Black' tubers directly outside in May.
Plant with the stump of last year's stem facing upwards. The tuber should be fully submerged but with the stump just below the soil surface.
Plant one tuber per 8-10" pot if growing on during spring. When
planting outside, space the tubers around 30-50cm apart from each other. Compact varieties don’t need so much space.Water-in thoroughly after planting and continue to water regularly once in full growth, but only when the soil appears to be nearly dry.
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Orders placed before 1 March 2025
You can expect your order in Feb/March 2025Orders placed 1 March - 15 April 2025
You can expect your order in April 2025Orders placed 16 April - 15 May 2025
You can expect your order within 10 business days
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