Flower-of-an-Hour (Hibiscus trionum): Annual with Cream Flowers, Purple Undersides, Burgundy Centers

Flower-of-an-Hour (Hibiscus trionum)

Flower-of-an-hour is a seldom-seen annual or short-lived perennial that performs as a perfect filler in beds and containers. It forms a well-branched compact mound of deeply lobed, dark green leaves. The flowers are stunning with cream petals, purple-hued undersides, and deep burgundy centers. Each flower lasts only a single day, but the plant blooms profusely all season and produces inflated seedpods. Flowers will not open on cloudy days.

Noteworthy Characteristics

Flowers last only one day each. Interesting seedpods. Fast grower.

Growing Conditions and Care

Full sun; moist, well-drained, fertile soil.

Propagation

Sow seeds indoors 4-6 weeks before last frost or outdoors after danger of frost.

Potential Problems

Rust, fungal leaf spots, bacterial blight, Verticillium wilt, viruses, stem rots, root rots. Whiteflies, aphids, mealybugs, scale insects, mites, Japanese beetles, caterpillars.

Quick Reference

• Height: 1–3 ft.
• Spread: 1–3 ft.
• Growth Habit: Spreads
• Growth Pace: Fast
• Light: Full Sun Only
• Moisture: Medium
• Maintenance: Moderate
• Bloom Time: Early Fall, Early Summer, Fall, Late Summer, Summer
• Flower Color: Pink, Red, White
• Uses: Beds and Borders, Container, Indoor Plant
• Seasonal Interest: Summer Interest
• Type: Annual