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 32 ecoregions — 22 climate-resilient through 2070 · 10 newly possible by 2070. Best matches first.

Arizona Mountains forests

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Atlantic coastal pine barrens

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California coastal sage and chaparral

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Central Pacific Northwest coastal forests

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Central-Southern Cascades Forests

Eastern Australian temperate forests

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Eastern Great Lakes lowland forests

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Edwards Plateau savanna

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What it needs

Conditions

Light

Full sun

Water

Moderate water

Spacing

144"

Habit

Small rounded broadleaf-evergreen subtropical fruit tree

Care tips

•

In USDA zones below 9, grow it in a container and bring it indoors before frost; outdoor trees need protection below 32F.

•

Plant in full sun in slightly acidic, well-draining sandy loam - it will decline in heavy, saturated soil.

•

Keep soil evenly moist (medium water) and avoid waterlogging to support steady flowering and fruit.

Lifecycle

Planting

Plant in deep, evenly moist, well-draining, slightly acidic sandy loam in full sun per Missouri Botanical Garden PlantFinder. Intolerant of heavy, saturated soils. Outdoors only in USDA zones 9-11; in colder climates grow in a container and overwinter indoors.

Transplanting

Move container trees up a pot size as roots fill in; outdoors, transplant young trees while temperatures are mild and protect from any frost.

Early growth

Keep soil evenly moist (medium water) without waterlogging. Protect from temperatures below 32F, including spring frosts that can damage flowers and young fruit, per Missouri Botanical Garden PlantFinder.

Maturity

Mature trees reach roughly 8-15 feet (taller in ideal climates) with a well-branched, rounded canopy. Fragrant white flowers appear March to April and fruit ripens in winter.

Propagation

Commercially propagated by grafting named cultivars onto rootstock; seed does not reliably reproduce the cultivar.

Pollination

Self-fertile

Sweet orange flowers are largely self-fertile and many commercial cultivars (such as navel types) are seedless and set fruit parthenocarpically. The fragrant white blossoms are nonetheless visited heavily by honey bees, which produce the well-known orange-blossom honey.

Plants don't grow alone

Nectar forage

Bee

European honeybee (Apis mellifera)

Honey bees forage nectar and pollen from the fragrant citrus blossoms; orange groves are a classic nectar source and the origin of commercial orange-blossom honey. (Apis mellifera is an introduced European species, not a North American native.)

For people

Edible

Grown worldwide for its sweet edible fruit eaten fresh or juiced, and for essential oil from the rind; Missouri Botanical Garden PlantFinder lists the fruit as "Showy, Edible." Suitable as a small ornamental, Mediterranean-garden, or edible-garden tree.

Native range

AHS heat range

6-12

Climate notes

•

Missouri Botanical Garden PlantFinder lists Citrus x sinensis for USDA zones 9-10 (oranges generally 9-11), full sun, and medium water, blooming March to April with white fragrant flowers, growing 8-15 feet tall and wide.

•

Missouri Botanical Garden PlantFinder reports it is best grown in deep, evenly moist, well-draining, slightly acidic sandy loams and is intolerant of heavy, saturated soils; trees need protection if temperatures drop below 32F in spring, and in colder climates can be grown as a container plant moved indoors for winter.

•

Missouri Botanical Garden PlantFinder notes susceptibility to pests including citrus rust mite and scales, and to diseases including citrus canker and citrus greening (Huanglongbing) - the latter a quarantine-significant disease in US citrus regions.

•

Not native to North America: Missouri Botanical Garden PlantFinder describes it as originally domesticated in subtropical Asia, a hybrid of mandarin (Citrus reticulata) and pomelo (Citrus maxima) likely originating in southern China.

In the designer

Growth over time

96-180" tall · 96-180" spread

Mature well-branched rounded canopy with reliable flowering and fruit.

Design roles: Focal point · Edible · Container

Seasonal interest

Spring

Summer

Fall

Winter

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

Sweet orange

At a glance

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