The improved Luna Series hibiscus is hardy to USDA zone 5 and in cooler climates, they benefit from some light mulch in the winter. The distinctive trumpet-shaped blooms open to a width of 6" to 8". The 3 foot tall by 2 foot wide plants are beautiful single specimen plants, but are also bushy, making very effective borders and hedges. Though a bit pricey they will provide a remarkable experience each year with their many blooms.
Perennial, zone 5-9
Germination: 10-30 days
Germination Temperature: Optimum soil temperatures 70-80ºF
Seed Planting Depth: Sow on the surface and lightly cover. Soaking seeds overnight aids germination
Starting Indoors: Start indoors 10-12 weeks before the last frost. Provide 70-80ºF soil temperature. Transplant after last frost, 24-36” apart
Sowing Outdoors: Direct sowing is not recommended
Growth Habit: Upright, branching
Height and Width: 24-36" by 24-36"
Spacing: 24-36" apart
Light Needs: Sun
Soil Needs: Fertile, well-drained
Approximate days to flower from seed: 120-130 days
Uses: Bedding plant and containers
Care: Water seedlings regularly until established. Amend soil with compost before transplanting. Mulch to maintain the soil moisture. Water well during dry spells. Hibiscus is slow to emerge from the ground in the spring. Pinch back new shoots to encourage more branching. Deadhead to keep the plant tidy looking.