Hibiscus Trionum Seeds

Venice Mallow (Hibiscus trionum) is a charming old-fashioned annual hibiscus admired for its unique creamy-yellow flowers highlighted by a dramatic deep maroon to purple center. Sometimes known as Flower-of-an-Hour because each individual bloom opens for only a single day, the plant continually produces fresh blossoms over many weeks, ensuring a constant display throughout the summer. The delicate flowers, paired with attractive deeply lobed foliage and unusual inflated seed pods, make this heirloom species a favorite for cottage gardens, wildflower meadows, and naturalized landscapes.

Native to parts of Europe, Africa, and Asia, but naturalized across much of North America, Hibiscus trionum grows quickly into bushy plants reaching 18 to 36 inches tall. The soft yellow flowers resemble miniature tropical hibiscus, opening in the morning sunshine before closing later in the day. Although each bloom is short-lived, dozens of new flowers continue appearing throughout the growing season, creating an ever-changing display of color.

Garden Uses

Venice Mallow is an excellent choice for cottage gardens, heirloom gardens, wildflower meadows, pollinator gardens, prairie plantings, and sunny borders. Its relaxed growth habit allows it to mingle naturally among cosmos, zinnias, bachelor buttons, coreopsis, ornamental grasses, and other informal flowering plants.

It also performs well in raised beds and larger patio containers where its distinctive flowers and ornamental seed pods can be appreciated up close. The attractive lantern-like seed capsules add interest even after flowering has ended.

Growing Information

Venice Mallow thrives in full sun and prefers well-drained, moderately fertile soil. It adapts readily to sandy, loamy, or average garden soils and tolerates periods of dry weather once established. Mature plants generally reach 18 to 36 inches tall with a spread of 12 to 18 inches.

Sow seeds directly outdoors after the danger of frost has passed or start indoors 4 to 6 weeks before the last frost. Plant seeds approximately ¼ inch deep and maintain soil temperatures between 70 and 75°F. Germination typically occurs within 7 to 14 days.

Once established, plants require little maintenance beyond occasional watering during prolonged drought. Deadheading is unnecessary, although removing mature seed pods will encourage continued flowering if self-seeding is not desired.