Wholesale citrus

Eureka lemon

Citrus limon ‘Eureka’

A thornless, productive true lemon with ridged fruit and a rougher rind; it needs one of the warmer, better-protected citrus sites.

EdibleTrue lemonThornlessFrost sensitive

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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

Much of the year, with the main crop fall through spring

Before you plant

These conditions determine whether it will thrive.

Required microclimate

Placement is part of the growing system.

Zone C — morning shade, hot afternoon sun, at the west end of the sunnier south-facing side. The extra heat finishes the fruit, and the wall releases warmth through frosty nights.

Cold hardiness

Cover in a hard freeze below 27°F

Lemons start taking damage around 26 to 27°F, and Eureka is more frost-sensitive than Lisbon. Cover it when a night below 28°F is forecast, and plant it near a south or west wall.

Leaves and wood: damaged below 27°F · Blossoms and fruit: below 28°F

Heat tolerance

Shade from late-afternoon sun

Less vigorous than Lisbon, with a thinner canopy that leaves fruit and bark exposed. Paint or shade the trunk, and don't skirt the lower branches.

Sources:

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

Right plant, right place

Will Eureka lemon 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, zest, cooking, and preserving

Planting & stewardship

How to help Eureka lemon 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 ↗