Sour orange tree with thick-skinned pebbly deep orange fruit on thorny branches with dark green leaves

Sour Orange

Citrus x aurantium
Categories:
Citrus  ·  
Oranges
Light
Full sun
Water
Deep, regular irrigation; not a low-water desert tree. Water established trees throughout the root zone to about 2–3 feet deep, allowing the upper few inches of soil to dry between irrigations. Water more frequently during extreme heat and less in winter; keep the trunk base dry.
Size
15-20 ft tall × 10-15 ft wide
Habit
Upright tree – single-trunk
Toxicity
Toxic — Pets & Humans
Description
Sour orange, also called bitter or Seville orange, is a thorny citrus tree with glossy leaves, fragrant blossoms, and thick-skinned, tart orange fruit used for marmalade, marinades, and preserves.
Bloom Time
Spring
Deciduous / Evergreen
Evergreen
Special Features
Attracts Bees / Pollinators, Edible, Fragrant
Growth Rate
Moderate
Growth Habit
Upright tree – single-trunk
Mature Size
15-20 ft tall × 10-15 ft wide
Flower Color
White
Foliage Color
Dark green
Landscape Use
Container / Patio, Edible / Orchard, Hedge / Screen, Specimen / Accent
Garden Style
Edible Garden, Hedge / Formal, Pollinator / Wildlife
Soil
Alkaline Tolerant, Sandy / Rocky, Well-Drained
Companion Plants
Autumn sage, Seasonal calendula, Society garlic
Toxic — Pets & Humans
Toxic to pets (mild GI upset); bitter fruit edible to humans when processed
Care Instructions

Light: Full sun; young trees benefit from afternoon shade during Phoenix summers. Protect exposed bark from intense sun.

Water: Deep, regular irrigation; not a low-water desert tree. Water established trees throughout the root zone to about 2–3 feet deep, allowing the upper few inches of soil to dry between irrigations. Water more frequently during extreme heat and less in winter; keep the trunk base dry.

Soil: Well-drained soil; sandy loam preferred. Tolerates moderately alkaline soil, but poor drainage and salt buildup cause problems. Avoid planting too deeply or in low spots.

Mature size: Typically 15–25 feet tall and 15–20 feet wide; size varies with rootstock, growing conditions, and pruning.

Bloom: Primarily late winter through spring in Phoenix; fruit generally ripens in winter and can remain on the tree for months.

Evergreen / deciduous: Evergreen.

Growth rate: Moderate.