What hardiness zones is Allium cepa 'Evergreen Hardy White' suitable for?

Allium cepa 'Evergreen Hardy White' is Evergreen Hardy White bunching onion, a perennial non-bulbing scallion growing 12-18 inches (30-45 cm) tall and 6-8 inches (15-20 cm) wide in clumps. Dark green hollow tubular foliage with white lower sheaths — the white base color is the cultivar's defining visual trait. In the amaryllis family (Amaryllidaceae). A non-bulbing type: harvested as scallions (green onions) — no bulb production. Perennial in zones 3-9: overwinters and the clump divides, regrowing each spring. The cold-hardiest bunching onion cultivar commonly available — withstands below-zero temperatures. Semi-evergreen: foliage persists in mild winters; tops die back in cold winters but roots survive and resprout. No day-length requirement for harvest (unlike bulbing onions). Open-pollinated: seed can be saved. Direct-sow early spring through fall. Succession-sow every 2-3 weeks for continuous supply. Shallow roots — consistent moisture required. All Allium contain thiosulfates: toxic to dogs, cats, and horses (Heinz body anemia). Deer-resistant. Full sun to partial shade. Growth rate is moderate.

Native Range

Open-pollinated cultivar (Japanese bunching onion type). The species A. cepa is native to Central Asia.

Suggested Uses

Grown in vegetable gardens, raised beds, and containers of at least 2 gallons (8 L). Perennial scallion — overwinters in zones 3-9 and regrows. Non-bulbing — no day-length requirement. Succession-sow. Toxic to pets. Deer-resistant.

How to Identify

Identified by dark green hollow tubular foliage with white lower sheaths in a clumping habit — a non-bulbing scallion. The white base, the clumping perennial habit, and the absence of bulb formation distinguish Evergreen Hardy White from bulbing onions. In Amaryllidaceae.

Appearance

Size & Dimensions

Height1' - 1'6"

Width/Spread6" - 8"

Reaches mature size in approximately 1 years

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Flowers in the second year or if overwintered — white to pale pink spherical umbels. Flowering is undesirable in scallion production. Cut flower stalks at the base.

Detailed Descriptions

Flower Description

White to pale pink spherical umbels on a hollow scape — only if allowed to bolt; undesirable in scallion production

Foliage Description

Dark green, hollow tubular, 0.3-0.5 inch (8-12 mm) diameter; the lower sheaths are white

Growing Conditions

Sun Requirements

Full Sun Partial Shade

Requires 4-10 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range6.0 - 7.0(Neutral)

357912

Soil Types

loam

Drainagewell drained

Water & Climate

Water Needs

Medium

Frost Tolerance

hardy

Time to Maturity

60-120 days from seed (scallion harvest)

Care & Maintenance

Care Guide

Full sun to partial shade. Well-drained soil pH 6.0-7.0. Direct-sow early spring through fall. Perennial in zones 3-9 — overwinters and regrows. No day-length requirement. Shallow roots — consistent moisture. Succession-sow. All Allium toxic to pets. Deer-resistant.

Pruning

Harvest by cutting at soil level or pulling. The clump divides and regrows. Cut flower stalks at the base if they appear. Trim damaged foliage in fall. In cold zones, tops die back but roots resprout.

Pruning Schedule

fallwinter