A Complete Guide to Growing Garlic in Autumn

With the arrival of autumn, garlic enters its prime planting season. As a crop with a unique flavor, rich health benefits, and a long growing cycle, garlic is a favorite among gardening enthusiasts and farmers. It's worth noting that a low temperature environment is essential for garlic's growth. This article will comprehensively introduce key garlic cultivation techniques, from the "vernalization" process of garlic to sowing steps and harvesting timing.

Low-Temperature Treatment Before Planting Garlic – Vernalization
Why is garlic cold-treated before planting?
Due to the unique nature of garlic's growth process, garlic bulbs differentiate and subsequently produce cloves only in low-temperature environments. Otherwise, garlic will easily become "single-headed." Low-temperature treatment allows garlic to bolt normally in the appropriate season, producing edible stems. This also breaks the garlic's dormancy period, shortens emergence time, and increases yield.
Prerequisites for Low-Temperature Treatment
Generally, in cold regions, garlic planted in autumn can undergo vernalization naturally, allowing bulb differentiation and bolting to occur normally in the spring of the following year. However, in warmer regions or when garlic is planted in spring, temperatures do not meet the requirements for vernalization, requiring artificial low-temperature treatment.
Low-Temperature Treatment Steps
Before planting garlic, store it in a cold storage or cellar, generally at 0°C to 10°C, for 30-40 days. Monitor the garlic carefully during this period and discard any moldy garlic. Tips: Place garlic seeds in a breathable mesh bag and hang them in a cold storage or cellar, maintaining an air humidity of around 65%.

Before vernalization, briefly germinate the seeds (soak them in warm water for 8–12 hours, then remove and air dry). Then, place them in a cool environment for vernalization. This will help them emerge faster after sowing.

Garlic Planting Steps and Methods
Choosing a Garlic Variety

• Hardneck garlic: Suitable for growing in cold regions, it produces low yields but large cloves. The young stems that sprout can be harvested and eaten. Examples include Rocambole, Porcelain, and Purple Stripe.
• Softneck garlic: Suitable for growing in warmer regions, it is one of the most common garlic varieties found in supermarkets. It has more cloves and typically lacks young stems. Examples include California Early, California Late, and Red.

You can choose the most suitable garlic variety for your region.
Garlic Planting Steps

• Choosing the Right Soil: Garlic requires loose, airy, well-drained soil rich in organic matter. Planting when the soil temperature is between 10-15°C (62-76°F) helps promote root growth before the ground freezes.
• Seed Selection and Treatment: Select healthy, uniformly sized cloves and apply cold treatment.
• Sowing: After cold treatment, sowing is generally best done in September or October. Plant the garlic cloves upright with the tips facing up, keeping the skins intact. Plant about 2 inches deep, 4-6 inches apart, and 9-12 inches apart. Cover with 2-3 inches of soil after watering. Alternatively, cover with organic matter for winter insulation.

The Best Time to Harvest Garlic

Improper harvesting timing can affect clove size, uniformity, and storage performance. Generally, we can judge garlic by the color of the leaves. When the lower two-thirds of the leaves have withered and yellowed, while the upper leaves remain green, the garlic is at its peak harvest. For hardneck varieties, harvesting is generally 20–25 days after the stems have been removed. Harvesting is best done on a day with 3–5 consecutive days of sunny weather ahead, allowing for easy drying. Avoid harvesting in the early morning to prevent excess moisture and mold.

Conclusion

Garlic planting in autumn is not complicated. As long as you choose the right variety for the climate, perform proper vernalization, sow and care appropriately, and grasp the harvest timing, you can harvest plump, high-quality garlic.