General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Annual
Sun Requirements: Full Sun
Full Sun to Partial Shade
Water Preferences: Mesic
Dry Mesic
Soil pH Preferences: Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Plant Height: 20-32 inches (50-80 cm)
Plant Spread: 12 inches (30 cm)
Fruit: Other: 5 valve brown capsule resembling little paper lanterns, each containing numerous, small dark brown to black kidney shaped seeds.
Fruiting Time: Late summer or early fall
Flowers: Showy
Flower Color: Bi-Color: petals are white/pale yellow w/ purple base
Bloom Size: 1"-2"
Flower Time: Late spring or early summer
Late summer or early fall
Uses: Will Naturalize
Edible Parts: Leaves
Eating Methods: Raw
Wildlife Attractant: Bees
Propagation: Seeds: Days to germinate: 10 - 14 days
Depth to plant seed: Lightly cover the seeds with soil.
Sow in situ
Start indoors
Can handle transplanting
Propagation: Other methods: Cuttings: Stem
Cuttings: Tip
Cuttings: Cane
Pollinators: Self
Various insects
Containers: Suitable in 3 gallon or larger

Common names
  • Flower of an Hour
  • Bladder Hibiscus
  • Venus Mallow
  • Hibiscus
  • Venice Mallow

Flower of an Hour (Hibiscus trionum) was a featured
Plant of the Day for September 16, 2015.
  • Posted by jmorth (central Illinois) on Oct 29, 2012 4:04 AM concerning plant:
    A common wildflower/weed in central and northern Illinois. Introduced from Europe as an ornamental. Each bloom (white/pale yellow w/ a purple base) lasts but a few hours.
    Self-seeds prolifically; seeds can remain viable in the soil for years. Plant is pollinated by bumble bees primarily. Caterpillars of the Checkered Skipper, Grey Hairstreak, and Painted Lady find them quite munchable. Common Illinois habitats are croplands, field edges, roadsides, railroad right of ways, gardens, vacant sites, and construction sites. Plant has an interesting calyx.
  • Posted by gardengus (Indiana Zone 5b) on Nov 13, 2011 6:06 PM concerning plant:
    Considered a weed/wildflower here. I find it pretty enough to leave a few in the garden even if the flower stays open for only a short time.

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