Rose of Sharon, Shrub Althea 'Diana'

Hibiscussyriacus

Family
Malvaceae (mal-VAY-see-ee)
Genus
Hibiscus (hi-BIS-kus)
Species
syriacus (seer-ee-AK-us)
Synonym
Spacing
8-10 ft. (2.4-3 m)
Hardiness
4-6 ft. (1.2-1.8 m)
Sun Exposure
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)
Bloom Color
Sun to Partial Shade
Bloom Time
Foliage
White/Near White
Other Details
Other details
Mid Summer
Late Summer/Early Fall
Propagation Methods
Deciduous
Seed Collecting
May be a noxious weed or invasive
Soil pH requirements
From woody stem cuttings
From softwood cuttings
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
Direct sow as soon as the ground can be worked
From seed; sow indoors before last frost
From seed; direct sow after last frost
From seed; germinate in a damp paper towel
Patent Information
Foliage Color
Allow pods to dry on plant; break open to collect seeds
Allow seedheads to dry on plants; remove and collect seeds
Properly cleaned, seed can be successfully stored
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed
Bloom Characteristics
Water Requirements
Where to Grow
Regional

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

Tuscaloosa, Alabama

Alachua, Florida

Jacksonville, Florida

Krotz Springs, Louisiana

Fallston, Maryland

East Longmeadow, Massachusetts

Hubbardston, Massachusetts

Winston Salem, North Carolina

Cleveland, Ohio

Hulbert, Oklahoma

Lake Oswego, Oregon

Lansdowne, Pennsylvania

Shippensburg, Pennsylvania

Quinlan, Texas

Richmond, Texas

Rosenberg, Texas

Portsmouth, Virginia

show all

Featured Videos

Gardener's Notes:

3
positives
0
neutral
0
negative
Sort By:
Sort By:
V
(Zone 8a) | September 2018 | positive

Mine grows in z9a without difficulty. It is trained as a standard and growing in full sun, amended clay soil. Delicate single petaled white bloom.

K
Lansdowne, PA (Zone 7a) | June 2013 | positive

Please note that the remark in the listing "may be invasive" does not apply to cultivar 'Diana' which is a sterile clone.After 25 yrs in ...Read More

A
Green Cove Springs, FL (Zone 9a) | August 2010 | positive

Wonderful large luminous blooms! Seems to have a few volunteers here in N Florida, but not excessive by any means - estimate 1 successfu...Read More

Featured
Spicebush Swallowtail
(Papilio troilus)
American Robin
(Turdus migratorius)
Featured
Spicebush Swallowtail
(Papilio troilus)
American Robin
(Turdus migratorius)