Blacknight Hollyhock
Alcea Rosea 'Blacknight'
Overview
Alcea rosea 'Blacknight', commonly known as Blacknight Hollyhock, is a striking perennial with 6-8 ft stalks adorned with deep, maroon-black blooms. This variety thrives in full sun and well-drained soil, adding dramatic vertical interest to the midsummer garden. Hardy in zones 3-8, it's excellent for back borders or as an architectural feature against walls or fences. Space plants 18-24 inches apart to allow ample growth.
Sun FullWater MediumZones 3–10Type Perennial
Culture
- Sun
- Full
- Water
- Medium
- USDA zones
- 3–10
Shape & size
Classification
- Type
- Perennial
- Family
- Malvaceae
See full data, regional cultivation notes, and design tools. Build a client presentation around this plant.
Start your 14-day trialPhotos (4)




Photographs by 3 contributors
- S.G.S., CC BY-SA 4.0 · source
- Don McCulley, CC BY-SA 4.0 · source
- Swallowtail Garden Seeds from Santa Rosa, CC BY 2.0 · source
Related plants

'All Eyes on Me' Rose Mallow
Hibiscus hybrid

America's Sweetheart™ Tropical Hibiscus
Hibiscus rosa-sinensis
Full

Shrub
Apricot Mallow
Sphaeralcea Ambigua
FullUSDA 7–11

Shrub
Azurri Blue Satin® Rose of Sharon
Hibiscus syriacus
FullUSDA 5–8

'Ballet Slippers' Rose Mallow
Hibiscus hybrid

'Berry Awesome' Rose Mallow
Hibiscus hybrid