perennial

Swamp Hibiscus

Hibiscus palustris

Essentials

At a Glance

Plant Type

Perennial

Height

60 inches

Width

36 inches

Light

Full Sun, Partial Sun

Zones

5, 6, 7, 8, 9

Water

Medium to wet

Humidity

High

Lifespan

Perennial

Native To

Eastern and Southern United States

Toxicity

Non-toxic to humans and pets

The Story

Plant Bio

Hibiscus palustris, commonly known as Swamp Hibiscus, is a perennial aquatic or semi-aquatic shrub distinguished by its large, showy, pink to red flowers and broad, lance-shaped green foliage. It typically grows in wetlands and marshy areas. This species is notable for its ability to thrive in wet, swampy conditions, making it an excellent choice for naturalized pond edges and water gardens, with striking flowers that attract pollinators.

Bloom Period:

EarlyLate

Uses & Benefits:

Provides lush foliage and vibrant flowers, enhancing shaded garden areas.

Prefers moist, acidic soils, helping to manage rainwater runoff.

Supports pollinators like hummingbirds and butterflies.

Planting

How to Grow

Tuck seeds or cuttings into moist soil in early spring.
Water regularly to keep soil consistently moist during growing season.
Mulch around the base to retain moisture and suppress weeds.
Prune lightly after flowering to maintain shape.
Fertilize with a balanced, acid-loving plant fertilizer in spring.
Divide in early spring or fall every 3–4 years for vigorous growth.

Pro Tip

Ensure moist, acidic soil and partial shade for best flowering.

Keep It Thriving

Care Guide

Do

Water consistently to keep soil moist 🌱
Mulch to retain soil moisture and regulate temperature
Prune lightly after flowering to shape the plant
Fertilize with an acid-loving fertilizer in spring

Don't

Allow soil to dry out completely ❌
Over-fertilize, which can cause weak growth
Expose to full, hot sun in the afternoon
Neglect pruning after flowering

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Divide
Fertilize
Spring Cleanup

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Moist, shaded borderRain garden featureWildflower meadow accent

Companion Plants

Ferns Joe Pye Weed Swamp Milkweed Blue Flag Iris Cinnamon Fern

Multiply

Propagation Methods

Good to Know

Common Questions

Swamp Hibiscus questions

What zones can Swamp Hibiscus grow in?

Swamp Hibiscus is hardy in USDA Zones 5–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Swamp Hibiscus deer resistant?

Not reliably. Deer may browse Swamp Hibiscus, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Swamp Hibiscus bloom?

Swamp Hibiscus typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Swamp Hibiscus need full sun?

Swamp Hibiscus does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.