Cold hardiness

Future

2050

2100

These values are location-based: this location's current hardiness is the baseline, and the 2050 value is a projected future climate for this same location.

Now

Zone 6b

USDA

Published baseline for this location from 1991-2020.

Source: USDA Plant Hardiness Zone Map 2023 (1991-2020 climatology) via ArcGIS FeatureServer

Well-suited

2050

Zone 7a

Plotwright

Projected zone for this same location in 2050 (2041-2070) using SSP3-7.0 (regional rivalry).

Well-suited

In plain terms: This location is in Zone 6b today. Its hardiness profile is cold winters, and coldest nights are typically around -3°F. By 2050, the projected hardiness zone is Zone 7a based on SSP3-7.0 (regional rivalry). That is a +0.5-zone shift from Zone 6b to Zone 7a by 2050.

✓

Well-suited today and still thriving in 2050.

Heat tolerance

Future

2050

2100

Heat tolerance values are location-based too: heat days today are observed at this site, and the 2050 value projects this same location under a future climate.

Loading AHS heat-zone data for this location...

Where this plant fits

Suitable across 41 ecoregions — 40 climate-resilient through 2070 · 1 suited today. Best matches first.

Appalachian mixed mesophytic forests

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Appalachian-Blue Ridge forests

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Arizona Mountains forests

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Atlantic coastal pine barrens

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Blue Mountains forests

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Canadian Aspen forests and parklands

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Central Pacific Northwest coastal forests

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Central Tallgrass prairie

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Central-Southern Cascades Forests

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Chilean Matorral

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What it needs

Conditions

Light

Full sun / Part shade

Water

Consistent moisture

Spacing

36"

Habit

Upright, clump-forming herbaceous perennial with a woody base

Care tips

•

Keep the soil reliably moist to wet — hardy hibiscus thrives at pond edges and in rain gardens but resents drying out, with high water needs and low drought tolerance.

•

Be patient in spring: it breaks dormancy late, so do not dig it out before the soil warms and new shoots appear from the woody base.

•

Give it full sun and shelter from strong wind; full sun produces better blooms and disease resistance (NC State Extension), and the tall stems can be wind-damaged.

Lifecycle

Planting

Plant in spring in full sun to partial shade in wet to constantly moist soils; NC State Extension notes full sun (6 or more hours) produces better blooms and disease resistance. It is hardy across USDA zones 4a-9b and is well suited to pond margins, rain gardens, and other consistently moist sites — it has high water needs and low drought tolerance.

Transplanting

A clump-forming herbaceous perennial — set out or divide plants in spring as new growth emerges, keeping the moisture-loving roots from drying out during the move.

Early growth

Hardy hibiscus is late to break dormancy in spring, so do not assume winter loss before the soil warms. Keep the soil reliably moist to wet through the first season; the plant tolerates heat, humidity, and brief flooding but resents drying out.

Maturity

Mature plants form an upright clump 2-6 feet tall and 2-5 feet wide, with woody lower stems and 4-8 inch (occasionally larger in cultivars) flowers from June to September. Cut the dead stems back in late winter or early spring; leaving them standing provides nesting habitat for stem-nesting bees (NC State Extension).

Propagation

NC State Extension lists propagation by seed, stem cuttings, and plant division. Division of the crown in spring is the most reliable way to keep a named flower color true.

Pollination

Self-fertile

The large, showy flowers are perfect (bearing both stamens and a central pistil on the prominent staminal column) and set seed readily. NC State Extension notes the flowers are attractive to hummingbirds, butterflies, and other pollinators, and that the species serves as a caterpillar host plant for 28 species of butterflies and moths — so it earns strong pollinator and habitat value even though a single plant can set seed on its own.

Plants don't grow alone

Larval host

Butterfly

Painted lady (Vanessa cardui)

Malvaceae genus-level inference: V. cardui larvae use mallow-family hosts broadly (LBJ Wildflower Center names native Hibiscus); H. moscheutos not species-cited.

For people

Not eaten by humans

Grown as an ornamental and native habitat plant for its enormous summer flowers and tolerance of wet soils, not as a food crop. NC State Extension documents no culinary use and lists no toxicity for Hibiscus moscheutos; absent a published edibility profile it is treated as inedible rather than a food plant.

Pet toxicity

NC State Extension does not list toxicity information for Hibiscus moscheutos; the species is not flagged as poisonous, but no affirmative non-toxic rating is published, so treat as an ornamental rather than relying on a safety claim.

Native range

Native across 25 US states.

AHS heat range

4-11

Native ecoregions

Naturally belongs in 16 ecoregions — its native range crosses a state or province each one spans (not necessarily this exact habitat).

Appalachian mixed mesophytic forests

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Appalachian-Blue Ridge forests

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Atlantic coastal pine barrens

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Central Tallgrass prairie

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Chihuahuan desert

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Cross-Timbers savanna-woodland

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Eastern Great Lakes lowland forests

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Edwards Plateau savanna

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Mississippi lowland forests

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Northeastern Coastal Forests

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Climate notes

•

NC State Extension lists Hibiscus moscheutos as a herbaceous perennial (with a woody base) hardy across USDA zones 4a-9b, native to southeast Canada, the central and eastern United States, and northeastern Mexico, growing 2-6 ft tall and 2-5 ft wide in full sun to partial shade with wet to constantly moist soils.

•

It is heat, humidity, and wet-soil tolerant and slightly salt tolerant (NC State Extension), making it well suited to rain gardens, pond and stream edges, and low spots that stay damp — but it has high water needs and low drought tolerance, so it is not a plant for dry borders.

•

NC State Extension flags possible problems with Japanese beetles, aphids, whiteflies, and leaf spots, plus deer browsing and wind damage on the tall stems; site it out of strong wind and in steady moisture for the best performance.

In the designer

Growth over time

24-72" tall · 24-60" spread

Mature 2-6 ft tall clump spreading 2-5 ft, blooming June to September with dinner-plate flowers.

Design roles: Focal point · Border · Structure · Pollinator

Seasonal interest

Spring

Summer

Fall

Winter

Filled = the plant has seasonal interest · ▾ now = your current season

Hardy hibiscus

At a glance

Related products

Why it matters

Cold hardiness

Heat tolerance

Where this plant fits

What it needs

Lifecycle

Pollination

Plants don't grow alone

For people

Native range

Climate notes

In the designer

Seasonal interest

Sources & citations