Swamp rose mallow (Hibiscus moscheutos)

Swamp rose mallow

Hibiscus moscheutos

A striking wetland perennial boasting massive, dinner-plate-sized blooms that bring a tropical flair to temperate gardens. Other names: crimsoneyed rosemallow, eastern rosemallow.

Requires full sun for optimal blooming and sturdy stem growth; tolerates light partial shade but will produce fewer flowers.
3/week
Easy
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Plant Needs

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Sunlight Requires full sun for optimal blooming and sturdy stem growth; tolerates light partial shade but will produce fewer flowers.
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Watering Thrives in wet, boggy conditions. Soil must be kept consistently moist and should never be allowed to dry out completely.
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Temperature Highly cold tolerant (USDA Zones 4-9); dies back to the roots in winter and emerges very late in the spring.
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Characteristics

  • Leaves: Ovate to lanceolate, 10-20 cm long, with toothed margins; upper surface is green and glabrous, while the underside is densely pubescent and whitish.
  • Flowers: Massive, 15-25 cm across, consisting of 5 overlapping petals in shades of white, pink, or rose, typically featuring a prominent dark crimson eye at the center and a central staminal column.
  • Stems: Sturdy, upright, cane-like, green to reddish, dying back completely to the ground in winter.
  • Fruit: A woody, ovoid capsule containing numerous rounded, dark brown seeds.
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Care Guide

Watering

Water deeply and frequently to maintain wet or constantly moist soil, especially during hot, dry spells.

Fertilization

Apply a balanced organic fertilizer as new shoots emerge (which is often late, around late May or June).. Heavy feeder; requires consistent nutrients during its rapid summer growth spurt.

Banana Peel Tea:Soak chopped banana peels in water for 24-48 hours. Dilute 1:1 with water and apply to the base to encourage large blooms. Discard peels in compost to avoid attracting pests.
Pruning
  • Winter/Spring: Cut all dead stems down to 5-10 cm above the ground in late winter or early spring before new growth begins.
  • Early Summer: Pinch back the growing tips when stems are about 60 cm tall to encourage branching and more blooms.
  • Autumn: Deadhead spent flowers to improve appearance, though leaving the seed pods can provide winter interest.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Non-toxic to cats per ASPCA guidelines.

Humans: Non-toxic to humans; flowers and young leaves are technically edible but mucilaginous.

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Garden Uses & Culture

Culture: A staple of American Victorian-era water gardens, admired for bringing a touch of the exotic to temperate landscapes without the need for a greenhouse.

Usage: - **Landscaping**: Excellent for rain gardens, pond edges, and low wet spots in the yard. - **Wildlife**: Highly attractive to hummingbirds, butterflies, and bees. - **Historical**: Native American tribes historically used the tough stem fibers to make cordage and twine.