Wholesale citrus

Rio Red grapefruit

Citrus × paradisi ‘Rio Red’

A deeply pigmented grapefruit with large, low-seeded fruit that can hold on the tree well into summer.

EdibleRed fleshFew seedsLong harvest

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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

December through early summer

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 26°F

Like most grapefruit, the tree starts taking damage around 26°F. Cover it when a night below 28°F is forecast, since the crop hangs on the tree all winter.

Leaves and wood: damaged below 26°F · Blossoms and fruit: below 27°F

Heat tolerance

Takes full sun and heat

Thrives on desert heat, which it needs for top quality, and takes full sun. Fruit holds on the tree into late May or June without going flat.

Sources:

extension.arizona.edu , citrusvariety.ucr.edu , ucanr.edu

Right plant, right place

Will Rio Red grapefruit 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

Fresh eating and juice

Planting & stewardship

How to help Rio Red grapefruit 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 ↗