Black Night Hollyhock
Alcea rosea 'Blacknight'
Essentials
At a Glance
Plant Type
Perennial
Height
60 inches
Width
24 inches
Light
Full Sun, Partial Sun
Zones
5, 6, 7, 8
Water
Moderate
Humidity
Average
Lifespan
Perennial
Native To
Asia
Toxicity
Non-toxic
The Story
Plant Bio
Tall perennial with dark, almost black flowers. Unique for its striking deep colored blooms, which stand out in the garden.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
Shipping costs Year-round shipping Free shipping
Planting
How to Grow
- Tuck seeds into well-draining soil in early spring for best germination.
- Mist cuttings regularly to maintain humidity and encourage root growth.
- Plant in full sun to promote vigorous flowering and healthy growth.
- Water deeply once a week during dry periods to keep soil moist.
- Fertilize with a balanced liquid feed every 4-6 weeks during growing season.
- Divide mature plants in early spring or fall to propagate new plants.
Pro Tip
Use organic compost to enrich soil and promote lush, vibrant blooms.
Keep It Thriving
Care Guide
Do
- Water regularly to keep soil evenly moist 💧
- Deadhead spent flowers to encourage more blooms
- Apply organic mulch to conserve moisture and suppress weeds
- Provide full sun for optimal flowering
Don't
- Avoid overwatering which can cause root rot ❌
- Do not forget to prune to shape and remove dead or diseased stems
- Refrain from planting in overly shady areas
- Avoid using harsh chemical pesticides excessively
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Pest Check | ||||||||||||
| Spring Cleanup | ||||||||||||
| Stake |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Black Night Hollyhock questions
What zones can Black Night Hollyhock grow in?
Black Night Hollyhock is hardy in USDA Zones 5–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Black Night Hollyhock deer resistant?
Yes — Black Night Hollyhock is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Black Night Hollyhock bloom?
Black Night Hollyhock typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Black Night Hollyhock need full sun?
Black Night Hollyhock does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Black Night Hollyhock drought tolerant?
Yes — once established (usually after the first full season), Black Night Hollyhock handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
More Alcea to compare
Old Farmyard Hollyhock
Alcea rosea 'Old Farmyard'
Double Hollyhock
Alcea x rosea 'Double Hollyhock Mix'
Hollyhock Country Mix
Alcea rosealca 'Country Mix'
Double Scarlet Hollyhock
Alcea rosea 'Double Scarlet'
Apricot Hollyhock
Alcea roseae 'Halo Apricot'
Hollyhock Mix
Alcea x hybrida 'Mix'
Keep exploring
Explore the genus
Collections featuring this plant
Hardy in your zone?
Grow Black Night Hollyhock with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
