How to Grow German Extra Hardy Garlic
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German Extra Hardy Garlic
Allium sativum var. ophioscorodon
vegetableGerman Extra Hardy is a hardneck garlic variety prized for its exceptional cold tolerance and robust flavor. It produces large bulbs with 4-6 cloves per bulb and distinctive curly scapes that can be harvested for culinary use. This heirloom variety originated in Germany and is ideal for cold climates.
When should you plant German Extra Hardy Garlic in your zone?
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Example German Extra Hardy Garlic timeline · Pittsburgh, PA (Zone 6b)
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Plant German Extra Hardy Garlic
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest German Extra Hardy Garlic
Around Nov 8≈ 210 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact German Extra Hardy Garlic dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-7, with exceptional performance in zones 3-5
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Planting & Dormancy
2-3 monthsIndividual garlic cloves planted in fall (September-November) establish roots before winter dormancy. Cloves develop a white root system that anchors into soil.
Plant cloves pointed end up, base down. Mulch with 3-4 inches of straw after ground freezes to prevent frost heaving. Ensure soil drains well to prevent rot.
Spring Emergence & Vegetative Growth
6-8 weeksGreen shoots emerge in early spring (March-April depending on zone). Plants develop 4-6 leaves and establish a strong root system. Visible growth is rapid during this stage.
Remove mulch gradually as soil warms. Apply balanced fertilizer or compost tea when shoots are 2-3 inches tall. Monitor for weeds and remove by hand to avoid root damage.
Scape Development
2-3 weeksHardneck varieties like German Extra Hardy produce a flowering stem (scape) that curls distinctively. Scapes emerge from the center of the plant in late spring.
Harvest scapes when they form a complete loop (usually late May-early June). Remove when 6-10 inches long by snapping or cutting at the base. Scape harvest directs energy to bulb enlargement.
Bulb Maturation & Curing
4-6 weeksAfter scape removal, lower leaves begin to yellow and dry (June-July). Bulbs swell underground as foliage senesces. Ready for harvest when 50% of leaves are brown and papery.
Stop watering 2-3 weeks before harvest to allow skin to cure naturally. Reduce fertilizer. Watch for soil cracks as an indicator of harvest readiness.
Harvest & Post-Harvest Curing
3-4 weeks curingBulbs are dug when foliage is mostly brown (late June-early July). Entire plant including roots is removed from soil.
Cure in a warm, dry, well-ventilated location (65-75°F, low humidity) for 2-3 weeks. Hang in bundles or spread on racks. Brush off soil gently without washing. Properly cured bulbs store 6-10 months.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Plant certified nematode-free cloves; crop rotation with non-host crops for 3+ years; soil solarization; avoid overwatering which favors nematodes
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Use certified disease-free seed stock; practice 6-8 year crop rotation; remove infected plants entirely; avoid contaminating tools with soil
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Row covers during spring; destroy plant debris thoroughly; encourage beneficial predators; diatomaceous earth applied to soil surface
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Spray with insecticidal soap during spring growth; remove affected foliage; increase air circulation by proper spacing
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Ensure excellent drainage; cure bulbs thoroughly; store in cool, dry conditions; discard soft or rotted bulbs immediately
Uses
Robust Flavor for Cooking
CulinaryGerman Extra Hardy garlic has a strong, pungent flavor with spicy notes and excellent heat retention in cooking. Perfect for roasting, sautéing, soups, and traditional German cuisine. [source]
Immune Support & Health Benefits
MedicinalFresh raw garlic contains allicin, a compound with documented antimicrobial and immune-boosting properties. Traditionally used for cold and flu prevention, cardiovascular health, and as a natural antibiotic. [source]
Scape Harvesting
CulinaryThe distinctive curly scapes are edible and delicious, with a milder garlic flavor than cloves. Scapes can be sautéed, added to stir-fries, made into pesto, or pickled. [source]
Natural Pest Repellent
HouseholdGarlic-based sprays and infusions deter garden pests including aphids, mites, and beetles. Used in organic gardening as a non-toxic pest management tool. [source]
Pollinator-Friendly Flowers
WildlifeIf left unharvested, garlic flowers are attractive to bees, butterflies, and other pollinators. Can provide late spring/early summer forage for beneficial insects. [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 50% of foliage has yellowed and browned, typically late June or early July in most northern zones. Dig carefully with a garden fork, lifting the entire plant with roots intact. Cure immediately in a warm, dry, well-ventilated space for 2-3 weeks. Cut stems 1 inch above the bulb once cured. Break off dried roots gently. Store in mesh bags or braids in a cool (50-60°F), dry location with good air circulation.
Fun Facts
- 🌱 German Extra Hardy is named for its extraordinary cold tolerance—it can survive temperatures below -20°F, making it the hardiest commercial garlic variety available.
- 🌱 The distinctive curved or looped scapes of hardneck varieties like German Extra Hardy are actually the plant's attempt to produce flowers; removing them channels energy directly into bulb enlargement, increasing yield by 10-15%.
- 🌱 Garlic has been cultivated for over 7,000 years and was so valued by ancient civilizations that Egyptian workers building the pyramids were allotted garlic rations for strength and stamina.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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