Height: 4-6 ft. (1.2-1.8 m) 6-8 ft. (1.8-2.4 m) 8-10 ft. (2.4-3 m) 10-12 ft. (3-3.6 m)
Spacing: 24-36 in. (60-90 cm) 36-48 in. (90-120 cm)
Hardiness: 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) USDA Zone 9b: to -3.8 °C (25 °F) USDA Zone 10a: to -1.1 °C (30 °F)
Sun Exposure: Full Sun Sun to Partial Shade
Bloom Color: Scarlet (Dark Red)
Bloom Time: Late Summer/Early Fall Mid Fall Late Fall/Early Winter
Foliage: Grown for foliage Evergreen Blue-Green Veined
Other details: This plant is attractive to bees, butterflies and/or birds Drought-tolerant; suitable for xeriscaping Average Water Needs; Water regularly; do not overwater Self-sows freely; deadhead if you do not want volunteer seedlings next season
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: Non-patented
Propagation Methods: From woody stem cuttings From softwood cuttings From seed; direct sow outdoors in fall From seed; direct sow after last frost
Seed Collecting: Allow pods to dry on plant; break open to collect seeds Allow seedheads to dry on plants; remove and collect seeds Wear gloves to protect hands when handling seeds Properly cleaned, seed can be successfully stored
On Sep 23, 2010, smurfwv from Cabin Creek, WV (Zone 6a) wrote:
LOVE this hibiscus! The only drawback is it goes where it wants, in one season, from seed, my hibiscus has gotten 5 feet tall and 10 fet long by 5 feet wide! HUGE plant. It bloomed for me in April and May, then it stopped blooming in the summer heat, and started back up as the night temps dropped in the 50's.
Everyone should try this plant, its absolutely gorgeous. Another downfall, the seed pods have spines inside and out so wear gloves to protect fingers, its worse than fiberglass insulation.
On Apr 2, 2009, htop from San Antonio, TX (Zone 8b) wrote:
I have grown this plant. Hibisus cannabinus is often confused with Hibiscus radiatus so I have completed research in an attempt to find distinguishing characteristics that differientiate the 2 plants. Hibiscus radiatus is an allotetraploid of Hibiscus cannabinus and perhaps Hibiscus surratensis. The term allotetraploid refers to an organism that contains four complete copies of the genome, but two (and rarely, one) of the copies are from a different species than the other two copies. H. cannabinus leaves and calyx lobes are glandular and has epicalyx (a series of bracts subtending and resembling a calyx) segments attached to the calyx which are not characteristics of H. radiata. H. cannabinus has an elongate nectary gland at the base of the lower leaf midrib and on the midvein of each calyx lobe as well as a whitish tomentellum on the calyx which H. radiatus does not have. H. radiatus has a tooth-like appendage below the apex on the inner surface of the epicalyx bractlets which is not present on H. cannbinus.. H. cannabinus blooms are 4 to 6 inches across; whereas, H. radiatus has 3 to 3.5 inch across blooms. In many references, H. radiatus is said to grow a little over 3 feet tall; however, in cultivation, it can grow 6 to 8 feet tall. In cultivation H. cannabinus can grow 12 to 15 feet tall. Both can have cerise-pink (mauve-pink, burgandy-pink) that have a dark center. H. radiatus var. flore purpureo is one with rose-purple petals. I have grown H. cannabinus. Judging from photos that I know correctly identify H. radiatus, the leaflets of H. radiatus appear to broaden more in their middle sections as compared to H. cannabinus leaflets. The above information has been gathered from various scientific resources on the internet. Many websites I believe have misidentified H. cannabinus as H. radiata and vice-a-versa. I do not have any books which include detailed descriptions of H. radiatus nor H. cannabinus. Please let me know if any of the above information is incorrect and please add information that may be of assistance with the identification of H. radiata and H. cannabinus.
Note: H. cannabinus and H. radiatus are deer resistant due to the tiny thorns on the undersides of their leaves and along their stems.
This plant has been said to grow in the following regions:
El Mirage, Arizona Bradley, Florida Crestview, Florida Port Saint Lucie, Florida Spring Hill, Florida Winfield, Kansas Barbourville, Kentucky Sackets Harbor, New York Kure Beach, North Carolina Malin, Oregon Colver, Pennsylvania North Augusta, South Carolina Harrison, Tennessee Austin, Texas (2 reports) Beaumont, Texas Bolivar Peninsula, Texas Cedar Park, Texas Dalworthington Gardens, Texas San Antonio, Texas Cabin Creek, West Virginia