Wholesale citrus

Diller Arizona sweet orange

Citrus sinensis ‘Diller’

Also known as Arizona sweet orange · Diller orange

A productive Arizona-origin sweet orange chosen primarily for abundant, richly flavored juice in the Salt River Valley.

EdibleArizona selectionJuice orangeProductive

Check the current program →

Landscape layersLower canopy

Mature size

Usually 10–20 ft tall and wide; rootstock and pruning change final size

Climate fit

Urban core · USDA 9b–10a · Valley suburbs · USDA 9a–9b · Desert outskirts · USDA 8b–9b

Special categories

EDIBLE

Winter chill

None

Typical harvest

Late fall through early spring in the low desert

Before you plant

These conditions determine whether it will thrive.

Required microclimate

Placement is part of the growing system.

Zone B — sun morning and afternoon on the open south-facing side. Tough enough for full exposure and more productive for the extra hours.

Cold hardiness

Cover while young

Like most sweet oranges, leaves and twigs take damage in the mid 20s, and this Phoenix-born variety is said to be a bit hardier than average. Cover it its first two or three winters, and pick or cover ripe fruit if a night below 28°F is forecast.

Leaves and wood: damaged below 25°F · Blossoms and fruit: below 28°F

Heat tolerance

Takes full sun and heat

Bred in Phoenix in 1910 and very productive in desert heat. It takes full sun, but paint or shade any bare trunk so the bark doesn't sunburn.

Sources:

citrusvariety.ucr.edu , extension.arizona.edu , galveston.agrilife.org

Right plant, right place

Will Diller Arizona sweet orange grow at your Arizona property?

Plant in fast-draining soil with the graft union above grade. Keep mulch away from the trunk and avoid lawn irrigation at the root crown.

Best regional fit: Urban core · USDA 9b–10a, Valley suburbs · USDA 9a–9b, Desert outskirts · USDA 8b–9b.

Light

Sun exposure

Full sun; young trunks and exposed scaffold limbs need sunburn protection

Water

Irrigation

Deep, regular irrigation with drying between cycles; expand the wetted zone as the canopy grows

Fruit set

Pollination

Self-fruitful

Harvest

How to use it

Juice first; also useful for fresh eating

Planting & stewardship

How to help Diller Arizona sweet orange thrive

1
Verify both the named cultivar and rootstock on the nursery tag before planting.
2
Whitewash newly exposed bark and protect cold-sensitive trees during hard freezes.
3
Feed in several light applications during the active season rather than one heavy dose.
4
Let fruit color and flavor—not a calendar date alone—confirm harvest readiness.

Read the horticultural reference ↗