Description
Double Black Hollyhock Seeds grow into tall Alcea rosea flower spikes with dark burgundy-purple, near-black double blooms and soft gray-green foliage. Use this dramatic vertical flower at the back of borders, along fences, or in cottage gardens where height, texture, and deep color make the planting feel intentional.
Why Grow It
- Near-black burgundy-purple double blooms on tall upright spikes.
- Excellent back-of-border presence for cottage gardens, fences, and walls.
- Pairs beautifully with pale, white, silver, and soft pink companion flowers.
Growing Information
| Botanical name | Alcea rosea Nigra |
|---|---|
| Life cycle | Biennial or short-lived perennial flower |
| Mature height | 5-7 ft. tall in bloom |
| Light | Full sun |
| Bloom or harvest window | Summer bloom, often strongest in the second year |
| Seed count | 10 seeds |
| Sowing advice | Start indoors 6-8 weeks before transplanting or direct sow after frost. Cover seed lightly, keep evenly moist, and transplant to a permanent position because tall hollyhocks prefer room to establish. |
| Spacing | 18-24 in. apart with support or wind protection in exposed sites |
| Germination | Typically 10-21 days at warm room temperatures |
Best For
- back-of-border planting
- cottage garden walls and fences
- dramatic cut flower-style beds
- pollinator-friendly vertical color
FAQ
Will Double Black Hollyhock bloom the first year?
Hollyhocks are often biennial, so the strongest bloom is commonly in the second year. Early indoor sowing can sometimes encourage earlier flowering.
Does it need support?
Tall spikes benefit from a sheltered site, fence line, or light staking in windy gardens.
Where should I plant it?
Choose full sun, well-drained soil, and the back of a border where mature height will not shade smaller plants.
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