Growing Garlic - The Backyard Pantry

Growing Garlic (Allium sativum) in Missouri (Zone 6b-7a), including tips for preparing, planting, and caring for garlic in this climate:

1. Choose the Right Variety

Hardneck Garlic: Best suited for Missouri’s climate, hardneck garlic is more winter-hardy and typically produces larger cloves. It also has a more complex flavor profile.
- Varieties:
  - ‘Rocambole’: Known for its rich flavor, easy-to-peel cloves, and good storage.
  - ‘Purple Stripe’: A popular variety with a strong, spicy flavor.
  - ‘Porcelain’: Known for its robust flavor and larger bulb size.
Softneck Garlic: Generally produces smaller cloves, has a longer shelf life, and is more suited to milder climates. While it can grow in Missouri, hardneck varieties are usually a better choice.
- Varieties:
  - ‘Silverskin’: Produces long-lasting bulbs, and its cloves are arranged in multiple layers.
  - ‘Artichoke’: A mild-flavored garlic that stores well.

2. Planting Time

Best Planting Time: Garlic is typically planted in the fall in Missouri, around mid to late October. This allows the bulbs to establish roots before the first frost. Fall planting also allows garlic to undergo cold stratification, which helps the bulbs form properly.
Frost Tolerance: Garlic is hardy and can survive winter temperatures, making fall planting ideal. The garlic will remain dormant through the winter months and resume growing in the spring.
Spring Planting: If you miss the fall window, you can plant garlic in the early spring as soon as the soil can be worked, typically in March or April. However, fall planting gives the best results.

3. Site Preparation

Soil Requirements: Garlic prefers well-draining, fertile soil rich in organic matter. The soil pH should be 6.0–7.0.
- Amendments: Improve soil fertility by adding compost or well-rotted manure. This helps with drainage and provides nutrients for bulb development.
Soil Depth: Prepare the soil to a depth of about 8–10 inches, ensuring the soil is loose to allow the garlic cloves to grow freely.
Location: Choose a full-sun location that receives at least 6–8 hours of direct sunlight per day. Garlic needs sunlight for vigorous growth, particularly during the early spring.
Spacing: Garlic should be spaced 4–6 inches apart in rows that are 12–18 inches apart. Proper spacing ensures good air circulation and prevents overcrowding, which can lead to disease.

4. Planting

Garlic Cloves: Garlic is typically grown from individual cloves, which are separated from the bulb before planting. Avoid using grocery store garlic, as it may not be suitable for your region and could carry diseases. Instead, buy certified seed garlic from a reputable supplier.
Planting Depth: Plant each garlic clove with the pointed end up, about 2 inches deep into the soil. The base of the clove should be around 2 inches below the soil surface.
Row Spacing: Space rows 12–18 inches apart to provide enough room for the garlic to develop properly.
Watering: Water well after planting, ensuring the soil is moist but not waterlogged. Garlic prefers consistent moisture throughout the growing season, but too much water can lead to rotting.

5. Watering and Maintenance

Watering Needs: Garlic requires 1–1.5 inches of water per week, either from rainfall or irrigation. The soil should be kept evenly moist, especially during the active growing season (spring). However, garlic is prone to rot if overwatered, so ensure proper drainage.
Watering Method: Use a drip irrigation system or soaker hoses to water at the base of the plants, keeping the foliage dry to reduce the risk of fungal diseases like downy mildew or rust.
Weeding: Keep the area around your garlic bed free of weeds. Garlic has shallow roots, and weeds will compete for nutrients and moisture. Use mulch, such as straw or grass clippings, to suppress weeds and maintain moisture.
Fertilization: Garlic is a moderate feeder and benefits from a balanced fertilizer that is high in phosphorus and potassium for bulb development. Apply a slow-release fertilizer in the spring when growth resumes, and again as the bulbs start to swell. Avoid excessive nitrogen, as it can lead to lush foliage growth without bulb development.

6. Growth and Bulb Formation

Winter Dormancy: After planting in the fall, garlic enters a period of dormancy over the winter. The cold temperatures trigger the bulbs to begin forming roots. During this time, avoid disturbing the garlic.
Spring Growth: In early spring, garlic will begin to grow new shoots as temperatures rise. These shoots will develop into long, green leaves.
Scapes: If growing hardneck garlic, you’ll notice flower scapes (curled shoots) appearing in late spring to early summer. Cutting scapes helps direct energy back into bulb production, leading to larger bulbs. You can use the scapes in cooking as well.
Bulb Formation: Garlic’s bulb formation typically occurs in mid-to-late spring as the plants grow taller. The individual cloves begin to enlarge, and the outer skins thicken.

7. Pest and Disease Management

Common Pests:
- Onion Maggots: These pests can damage the roots. Protect your garlic by using row covers or applying organic insecticides if necessary.
- Thrips: These insects can damage garlic leaves. If you spot thrips, treat your plants with insecticidal soap or neem oil.
Diseases:
- Downy Mildew: Garlic is susceptible to fungal diseases. To prevent this, provide good air circulation, and avoid overhead watering. Use fungicides if necessary.
- Fusarium Wilt: This disease causes garlic to wilt and rot. Use disease-free seed garlic, and practice crop rotation to reduce the risk of Fusarium.
- Garlic Rust: This fungal disease appears as yellow-orange spots on the leaves. Use disease-resistant varieties, and remove infected plants to prevent spread.
- White Rot: A common and serious fungal disease that causes the roots and bulbs to rot. Avoid planting garlic in areas previously affected by white rot.

8. Harvesting

Timing: Garlic is typically ready to harvest in mid to late summer, around late June to July, depending on the variety and planting time. The leaves will begin to yellow, and the plant will stop growing vertically.
How to Harvest: Gently dig around the garlic bulb with a fork or shovel, being careful not to damage the bulbs. Lift the garlic carefully from the ground, and remove any excess soil.
Signs of Maturity: When the lower leaves have turned yellow and fallen over, and the upper leaves begin to yellow, your garlic is likely ready for harvest.

9. Curing and Storing

Curing: After harvesting, garlic needs to be cured in a warm, dry, well-ventilated area for 2–4 weeks. This allows the skins to dry and harden, prolonging storage life. Hang garlic in bundles or lay them flat on a screen.
Storage: Once cured, store garlic in a cool, dry, dark place with good air circulation. The ideal storage temperature is 50–60°F with low humidity. Properly cured and stored garlic can last for several months, depending on the variety.
Braiding: Hardneck garlic can be braided for easy storage, while softneck garlic typically has a longer shelf life and is better suited for storage in mesh bags or boxes.

10. Considerations for Missouri’s Climate

Winter Hardiness: Garlic is very cold-hardy and can withstand Missouri’s winter temperatures, especially hardneck varieties. Mulching with straw or leaves can help protect garlic in colder winter conditions.
Humidity: Missouri’s humidity can promote fungal diseases. Provide adequate air circulation around garlic during both growth and curing to prevent excess moisture buildup.
Frost Sensitivity: Garlic needs to be planted before the first hard frost in fall (typically around mid-October in Missouri). Garlic can tolerate the cold temperatures of winter, but the plants should be well-established by the time the first frost arrives.

11. Challenges

Diseases and Pests: Garlic can be prone to diseases like white rot and downy mildew, especially in humid climates. Practice good crop rotation, avoid overhead watering, and use disease-free seed garlic to minimize these risks.
Cold Damage: In extreme winters, garlic may suffer from damage if not properly mulched. Always mulch well for winter protection.
Inconsistent Bulb Size: Garlic may produce smaller bulbs if water or nutrients are not consistent, so make sure the plants are properly cared for during their growth cycle.

By following these steps, you can successfully grow garlic in Missouri’s Zone 6b-7a. This hardy crop requires careful attention, especially in terms of planting timing, watering, and pest management. With proper care, you’ll be able to enjoy a bountiful garlic harvest! Let me know if you need more detailed info or have any specific questions.