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

Won't grow here

2050

Zone 7a

Plotwright

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

Won't grow here

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.

✕

Out of range today and still out of range 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 39 ecoregions — 34 climate-resilient through 2070 · 5 newly possible by 2070. 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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California coastal sage and chaparral

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Canadian Aspen forests and parklands

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Central Pacific Northwest coastal forests

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Central-Southern Cascades Forests

What it needs

Conditions

Light

Full sun / Part shade

Water

Consistent moisture

Spacing

18"

Habit

Clumping tropical rhizomatous herbaceous perennial

Care tips

•

Plant rhizomes 4 inches deep in spring once soil is warm; give it the hottest, most humid spot you have.

•

Keep the soil consistently moist to wet — drought stress invites spider mites and stalls the rhizome growth you are after.

•

In zones colder than 8, grow it in a large container and lift or overwinter the rhizomes indoors before frost.

Lifecycle

Planting

Winter hardy only to USDA Zones 8-11; in early spring plant rhizomes about 4 inches deep in organically rich, fertile, consistently moist but well-drained soil in full sun to part shade. Plants want hot summers and high humidity (Missouri Botanical Garden PlantFinder).

Transplanting

Lift and divide the rhizome clusters in spring or summer; replant divisions with at least one bud (NC State Plant Toolbox).

Early growth

Keep soil consistently moist to wet through the growing season — Missouri Botanical Garden rates its water needs medium to wet and notes it tolerates wet soil. Spider mites may appear if soils become overly dry.

Maturity

Mature clumps reach 3-4 feet tall and wide with pale yellow flower spikes in July and August; the branched rhizomes are unearthed, boiled, dried, and ground into the spice. In zones colder than 8, grow in containers and overwinter the rhizomes indoors or lift and store them.

Propagation

Division of the rhizomes is the only practical method — the flowers are sterile and do not set viable seed (NC State Plant Toolbox).

Pollination

Sterile — propagate vegetatively

NC State Extension reports the flowers of Curcuma longa are sterile and do not produce viable seed, so the plant is grown and propagated entirely from rhizome division rather than by pollination. The showy pale yellow summer spikes are ornamental but are not a route to seed.

For people

Edible with preparation

Turmeric is grown for its rhizomes, which are boiled, dried, peeled, and ground into the bright yellow-orange spice that is the main ingredient in curry powder (Missouri Botanical Garden PlantFinder; NC State Plant Toolbox). The rhizome is the edible part and requires processing; the spice is used as a culinary condiment and, historically, as a dye and in traditional medicine.

Native range

AHS heat range

9-12

Climate notes

•

Missouri Botanical Garden PlantFinder lists Curcuma longa as winter hardy to USDA Zones 8-11, 3-4 feet tall and wide, full sun to part shade, water medium to wet, blooming pale yellow July to August; native range India and Malaysia.

•

NC State Extension Gardener Plant Toolbox lists USDA hardiness zones 8a-11b, leaves to 40 inches long, sterile yellowish-white flower spikes 4-6 inches long, and propagation by rhizome division; it tolerates acid to neutral soils that stay moist to occasionally wet.

•

Both sources report no serious insect or disease problems; red spider mites can occur on older plants or in soil that dries out, and young leaves may be browsed by slugs and snails (NC State Plant Toolbox).

•

Tolerates hot to extreme summer heat — a tropical species of India and Malaysia that demands hot summers and high humidity and is winter-tender below USDA Zone 8.

In the designer

Growth over time

36-48" tall · 36-48" spread

Mature 3-4 foot clump with summer flower spikes and a harvestable rhizome cluster.

Design roles: Edible · Structure · Container

Turmeric

At a glance

Why it matters

Cold hardiness

Heat tolerance

Where this plant fits

What it needs

Lifecycle

Pollination

For people

Native range

Climate notes

In the designer

Sources & citations