Wholesale citrus

Ponderosa lemon

Citrus × pyriformis ‘Ponderosa’

A lemon–citron hybrid grown as much for spectacle as the kitchen, producing grapefruit-sized, thick-peeled fruit.

EdibleVery large fruitCitron hybridOrnamental

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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

Intermittently through the year in warm sites

Before you plant

These conditions determine whether it will thrive.

Required microclimate

Placement is part of the growing system.

Zone A — morning sun, afternoon shade, at the east end of the sunnier south-facing side. Shields thin skin and variegated foliage from west sun, and gives blood oranges the cooler afternoons they need to color.

Cold hardiness

Cover on every frost night

A lemon and citron cross, and citrons are the most cold-tender citrus. Temperatures in the high 20s can badly damage it. Cover it on any frost night and plant it against a warm wall.

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

Heat tolerance

Shade from late-afternoon sun

Handles heat, but its huge fruit is exposed on the outside of the tree, where sun scorch hits hardest. Morning sun with afternoon shade is the safer spot.

Sources:

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

Right plant, right place

Will Ponderosa 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 and zest; fruit is very large and thick skinned

Planting & stewardship

How to help Ponderosa 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 ↗