How to Grow Garlic German Extra Hardy

Garlic German Extra Hardy

Allium sativum

vegetable

German Extra Hardy is a cold-tolerant hardneck garlic variety prized for its exceptional winter hardiness and ability to thrive in harsh northern climates. It produces large, flavorful bulbs with excellent storage qualities and reliable clove production. This heirloom variety is particularly valued by gardeners in USDA zones 2-4 where many other garlic varieties struggle.

Growing Conditions

☀️

Sun: Full sun, 6-8 hours daily minimum

💧

Water: Moderate water during growth; keep soil consistently moist but not waterlogged. Reduce watering after June as bulbs mature. Provide 1-1.5 inches per week during active growth.

📏

Spacing: 6 inches

📅

Days to maturity: 240-270 days (planted in fall, harvested the following summer)

🌱

Planting depth: 2 inches (base of clove 2 inches deep)

Soil

Type: Well-draining loamy soil, rich in organic matter

pH: 6.0-7.0

Amendments:

Aged compost Well-rotted manure Bone meal Rock phosphate Perlite or coarse sand for drainage

Growing Zones

Find your zone →

Thrives in zones 2-5, excellent cold hardiness for northern gardeners

2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a

Growth Stages

Dormancy & Root Development

October-February (4-5 months)

Cloves planted in fall (September-November) establish roots over winter while dormant. Little visible above-ground growth occurs during cold months.

Plant after soil temperature drops to 60°F or below. Mulch with 4-6 inches of straw or leaves after ground freezes to prevent frost heave. Ensure good drainage to prevent rot.

Spring Emergence

March-April (4-6 weeks)

Shoots emerge as soil warms in spring, pushing through mulch. Young plants develop 3-4 leaves initially. Growth accelerates with longer days and warming temperatures.

Remove excess mulch as growth emerges to allow shoots through. Begin regular watering as soil dries. Apply balanced fertilizer or compost tea. Monitor for early pest activity.

Vegetative Growth

May-June (6-8 weeks)

Vigorous leaf and stem development. Plants grow tall with 6-8 leaves, developing strong root systems. Hardneck varieties produce a flowering scape (flower stem) that emerges from the center.

Keep soil consistently moist. Feed with nitrogen-rich fertilizer early in this stage, then switch to phosphorus-rich formulas by late May. Remove scapes when 6-8 inches long (2-3 weeks before harvest) for larger bulbs, or leave for ornamental value and seed production.

Bulb Development & Maturation

July-early August (4-6 weeks)

Energy shifts from leaf growth to bulb enlargement as daylength increases. Outer leaves begin yellowing from bottom up. Bulbs swell with individual cloves becoming distinct and papery skin forms.

Reduce watering significantly; soil should be somewhat dry. Stop fertilizing. Ensure good air circulation to prevent disease. Monitor for any remaining pests. Do not remove the yellowing leaves—they feed the bulb.

Harvest & Cure

August harvest, 3-4 weeks curing

Leaves dry and fall over; approximately 50% turn brown and papery. Bulbs are fully formed with tight cloves and protective outer skin. Time to dig bulbs.

Harvest when lower leaves are brown but upper leaves still have green at base. Cure in warm (70-80°F), dry, well-ventilated location for 3-4 weeks. Brush off loose soil gently; do not wash. Trim roots and stems once fully dry.

Companion Planting

Plan your garden →

Plant with:

Strawberry Beet Onion Carrot Tomato Lettuce Chamomile Parsley

Avoid planting near:

Beans Peas Cabbage Sage Fennel Other garlic (to reduce disease pressure)

Common Pests

Rotate crops away from garlic for 6-8 years. Practice strict sanitation with tools. Avoid overhead watering. Solarize soil if infection occurs. Plant in well-draining soil to reduce conditions that favor the disease.
Ensure excellent drainage. Cure bulbs properly in dry conditions. Store in cool (32-40°F), dry location. Use only clean, disease-free seed cloves for planting.
Maintain adequate air circulation. Remove and destroy heavily infested leaves. Use sulfur spray if needed during early growth stages.
Row covers over young plants. Proper spacing for air circulation. Remove damaged plants promptly. Crop rotation reduces soil-dwelling larvae.
Strong spray of water to dislodge. Neem oil or insecticidal soap spray. Remove infested leaves. Encourage beneficial insects.

Uses

🍳

Robust Flavor for Cooking & Raw Use

Culinary

German Extra Hardy garlic offers a bold, complex flavor profile with both pungency and sweetness when raw, and rich, mellow notes when roasted or cooked. The large cloves are ideal for mincing, slicing, or using whole in soups, stews, and sauces. [source]

💊

Traditional Health & Immune Support

Medicinal

Garlic has been used for centuries in folk medicine for potential immune-boosting and cardiovascular benefits. The sulfur compounds, particularly allicin, are believed to have antimicrobial and anti-inflammatory properties. [source]

🏠

Natural Pest Deterrent

Household

Garlic infusions or crushed garlic scattered in the garden can help deter aphids, Japanese beetles, and other pests. It's also used in traditional companion planting to protect neighboring vegetables. [source]

🎨

Braiding & Decorative Storage

Craft

German Extra Hardy's hardneck variety is particularly suited to braiding into attractive garlic braids or wreaths, which serve as beautiful kitchen decor while maintaining long-term storage. [source]

🦋

Pollinator & Beneficial Insect Support

Wildlife

If you leave scapes unharvested, garlic flowers are ornamental and attractive to bees, beneficial wasps, and other pollinators, supporting garden biodiversity. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Harvest when lower 3-4 leaves are brown and papery (typically late July to early August, depending on location). Dig carefully with a fork to avoid bruising bulbs. Cure in a warm, dry, well-ventilated space for 3-4 weeks until outer skin is papery and stems are completely dry. Store in cool (32-40°F), dark, dry conditions with good air circulation. German Extra Hardy stores exceptionally well for 6-8 months or longer.

Fun Facts

🌱 German Extra Hardy is a hardneck variety, meaning it produces a stiff, central flower stalk that can be harvested as a culinary delicacy called a 'scape.' These are gourmet items that appear in farmers markets and are delicious pesto-ed, grilled, or stir-fried.
🌱 This variety has been grown for centuries in cold climates and was likely brought to North America by German immigrants, earning its memorable name. Its exceptional cold tolerance allows it to thrive where many commercial garlic varieties would fail.
🌱 Garlic cloves contain thiosulfinate compounds that produce allicin when cells are damaged by cutting or crushing. Raw garlic creates maximum allicin, which decreases with cooking, explaining why cooked garlic tastes milder than raw.

Want personalized planting timelines?

Get started free