Wholesale deciduous

Interlaken grape

Vitis 'Interlaken Seedless'

Also known as Interlaken Seedless · Interlaken

An exceptionally sweet green seedless grape with greater cold tolerance than many table grapes, making it especially useful for mid- and high-elevation Arizona.

EdibleSeedlessCold hardyWholesale program

Landscape layersClimbing

Mature size

Train to a 10–20+ ft. trellis or arbor

Climate fit

Valley suburbs · USDA 9a–9b · Desert outskirts · USDA 8b–9b · High desert · USDA 6a–8b

Special categories

EDIBLE

Hardiness guidance

Best Arizona fit: zones 6–9

Typical harvest

Early to midseason, depending on elevation

Before you plant

These conditions determine whether it will thrive.

Cold hardiness

Hardy here

An American and European hybrid, much hardier than Thompson Seedless. Most hybrids like this are good to about -10°F, so cold is a non-issue here. A late frost after budbreak can still burn new shoots near 30°F.

Leaves and wood: damaged below -10°F · Blossoms and fruit: below 30°F

Heat tolerance

Shade from late-afternoon sun

Bred for cool climates, it needs less heat to ripen and comes in very early, so the crop is off before peak summer. Exposed clusters of its small berries can sunburn, so give it leaf cover or a little afternoon shade on a hot west wall.

Sources:

davewilson.com , doubleavineyards.com , aggie-horticulture.tamu.edu

Right plant, right place

Will Interlaken grape grow at your Arizona property?

A hybrid of Thompson Seedless and an American grape. Its cold tolerance makes it a compelling choice outside the hottest urban core, while low-desert growers should prioritize airflow and cluster shade.

Best regional fit: Valley suburbs · USDA 9a–9b, Desert outskirts · USDA 8b–9b, High desert · USDA 6a–8b.

Light

Sun exposure

Full sun at elevation; protect clusters from direct late-afternoon low-desert sun.

Water

Irrigation

Moderate, deep, and consistent during active growth and fruit development.

Fruit set

Pollination

Self-fruitful

Harvest

How to use it

Very sweet green seedless fruit for fresh eating and drying.

Planting & stewardship

How to help Interlaken grape thrive

1
Install a sturdy trellis and train a permanent trunk and cordons.
2
Use an annual dormant-pruning system suited to the fruiting wood.
3
Thin congested shoots to improve airflow without exposing fruit to harsh sun.
4
Harvest when berries are fully sweet because grapes do not continue ripening after picking.

Read the horticultural reference ↗