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key growing information
How to Grow Cranberry Hibiscus From Seed
How to grow ornamental hibiscus (false roselle) from seed for cut foliage: starting transplants, heat and mulch, pinching, soil, and harvest stage.
By Hensley’s Seed Co.
Cranberry Hibiscus - Key Growing Information
DAYS TO GERMINATION:
Seedlings come up fast, in 3–5 days at 70–76°F (21–24°C).
SOWING:
Transplants are recommended: sow 6–8 weeks before planting out and cover seed lightly. Plant out after frost danger has passed. Hibiscus loves heat, so a soil-warming mulch such as black plastic or black solar mulch helps.
LIGHT PREFERENCE:
Full sun; it thrives in heat and humidity.
PLANT HEIGHT:
Grows about 40–70" tall.
PLANT SPACING:
Space plants 24–36" apart.
HARDINESS ZONES:
Hardy in Zones 8–9.
STEM LENGTH:
12–70". Pinching isn't required, but pinching young plants greatly improves the length and quality of side branches.
HARVEST:
For cut foliage, harvest once leaves are mature rather than soft and stems are straight, firm and starting to turn woody.
SOIL REQUIREMENTS:
Moist but well-drained soil rich in organic matter; pH 5.8–6.5 is best.
NOTE:
Leaves show green and rust tones in the greenhouse and deepen to burgundy outdoors in full sun.SCIENTIFIC NAME: Hibiscus acetosella
ALTERNATE NAMES:
African rose mallow, false roselle
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