Flower-of-an-hour

Hibiscus trionum

Photo/Illustration: 
Jennifer Benner
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Flower-of-an-hour (Hibiscus trionum)
hy-BIS-kus try-OH-num
Genus:  Hibiscus
A seldom-seen annual or short-lived perennial, this easy-to-grow plant performs as the perfect filler in beds and containers. It forms a well-branched compact mound of deeply lobed, dark green leaves, which provide an interesting textural backdrop to its charming, hibiscus-type flowers. The flowers are truly stunning with their cream petals, purple-hued undersides, and deep burgundy centers. While each flower lasts only a single day, the plant blooms profusely all season and produces inflated seedpods. The flowers will not normally open on a cloudy day, but this is a small price to pay for such a gem of a plant.
Noteworthy Characteristics:  Flowers last only one day each. Interesting seedpods. Fast grower.
Care:  Put plants in a sunny spot with moist, well-drained, fertile soil.
Propagation:  Sow seeds indoors 4 to 6 weeks before the last frost or outdoors after danger of frost has passed.
Problems:  Rust, fungal leaf spots, bacterial blight, Verticillium wilt, viruses, stem rots, root rots. Whiteflies, aphids, mealybugs, scale insects, mites, Japanese beetles, and caterpillars can also cause problems.

Overview

Height
1 ft. to 3 ft.
Spread
1 ft. to 3 ft.
Growth Habit
Spreads
Growth Pace
Fast Grower
Light
Full Sun Only
Moisture
Medium Moisture
Maintenance
Moderate
Characteristics
Showy Flowers,
Showy Seed Heads
Bloom Time
Early Fall,
Early Summer,
Fall,
Late Summer,
Summer
Flower Color
Pink Yarrow,
Red,
White
Uses
Beds and Borders,
Container,
Indoor Plant
Seasonal Interest
Summer Interest
Type
Annuals

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