Home / Guides / Plant Files / Malvaceae

Alcea, Common Hollyhock, Garden Hollyhock 'Blackcurrant Whirl'

Alcearosea

Upload Image Print Article
Upload Image Print Article
Family
Malvaceae (mal-VAY-see-ee)
Info
Genus
Alcea (al-KEE-uh)
Info
Species
rosea (RO-zee-uh)
Info
Synonym
Sun Exposure
Full Sun
Foliage
Herbaceous
Height
4-6 ft. (1.2-1.8 m)
6-8 ft. (1.8-2.4 m)
Spacing
24-36 in. (60-90 cm)
Hardiness
USDA Zone 3a: to -39.9 °C (-40 °F)
USDA Zone 3b: to -37.2 °C (-35 °F)
USDA Zone 4a: to -34.4 °C (-30 °F)
USDA Zone 4b: to -31.6 °C (-25 °F)
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
Danger

Unknown - Tell us

Bloom Color
Dark Purple/Black
Maroon/Burgundy
Bloom Time
Mid Summer
Late Summer/Early Fall
Other Details
Category
Biennials
Perennials
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color

Unknown - Tell us

Where to Grow

Unknown - Tell us

Bloom Characteristics

Unknown - Tell us

Bloom Size

Unknown - Tell us

Other details

Unknown - Tell us

Soil pH requirements
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
Patent Information

Unknown - Tell us

Propagation Methods
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; sow indoors before last frost
From seed; direct sow after last frost
Self-sows freely; deadhead if you do not want volunteer seedlings next season
Seed Collecting
Allow pods to dry on plant; break open to collect seeds
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed
Regional

This plant is said to grow outdoors in the following regions:

Petersburg, Indiana

View this plant in a garden
7 members have or want this plant for trade

Featured Videos

Gardener's Notes:

Post Comment
0
positive
0
neutral
0
negative
Sort By:
Post Comment
Sort By:
Popular Plants
SEE ALL
Iris
Peppers
Hydrangeas
Hostas
Contribute to Dave’s Garden
Add a New Plant to the List
Featured
BUG FILES
Luna Moth
(Actias luna)
BIRD FILES
Yellow-billed Duck
(Anas undulata)
Quick Links
View All Families
View All Genera
View All Species
Freeze/Frost Dates
PlantFiles FAQ
Plants with no Photos
Contribute to Dave’s Garden
Add a New Plant to the List
Featured
BUG FILES
Luna Moth
(Actias luna)
BIRD FILES
Yellow-billed Duck
(Anas undulata)