When to Plant Garlic in Delaware (2026 Guide)
Garlic is an ideal crop for Delaware gardeners, as it offers a rewarding harvest and requires minimal upkeep once planted. Planting typically occurs in the fall after summer crops have been harvested, making it perfect for maximizing garden space. With a frost-free season of about 203 days in Zone 6b, with a median last spring frost of April 10, gardeners can strategically plan their planting.
In Delaware, the garlic planting season begins with indoor preparations and then shifts outdoors as temperatures cool. The Delaware climate, with its unique winter conditions, requires attention to the timing of planting. For those in Zone 6a, where the median last spring frost is April 18, it is crucial to monitor temperatures to ensure healthy growth.
Garlic matures slowly through the cooler months, enabling gardeners to utilize their beds in the fall and winter. The annual cycle of growing garlic culminates in a harvest that stretches from June to August. As you grow garlic in locations like Wilmington or Newark, be mindful of local climate variance during these months for optimal results.
Planting Schedule by USDA Zone in Delaware
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 6b | Start February 15 – March 1, ~6–8 weeks before April 10 | Transplant outdoors March 15 – April 10, after the last frost | Direct sow not applicable; garlic is planted from cloves | Harvest late June – early August, when 60–70% foliage has yellowed |
| Zone 6a | Start February 22 – March 8, ~6–8 weeks before April 18 | Transplant outdoors March 25 – April 18, after the last frost | Direct sow not applicable; garlic is planted from cloves | Harvest late June – early August, when 60–70% foliage has yellowed |
Garlic Planting Windows in Delaware
- Indoor start: Start your garlic cloves indoors from February 15 to April 1 for best results.
- Transplant outdoors: Transplant your garlic outdoors from March 15 to April 18, after the last frost date.
- Harvest: Expect to harvest your garlic from late June to early August, when lower leaves begin to yellow.
Common Mistakes Growing Garlic in Delaware
- One common mistake in Delaware is planting garlic too late in the fall, especially in Zone 6a. Waiting until after mid-April can result in poor growth, as the garlic may not establish roots before the hot summer months.
- Delaware's humid summer climate can lead to bulb rot if garlic is not harvested at the right time. Be attentive to the yellowing of leaves and avoid letting them die back completely before pulling the plants.
- Using small or damaged cloves for planting is another frequent mistake. In Delaware gardens, selecting the largest and healthiest cloves ensures a robust garlic harvest, avoiding potential disappointment come summer.
- Many novice gardeners in Delaware overlook the importance of proper curing. Without curing garlic in a dry, well-ventilated area for 3–6 weeks, the storage life can drop dramatically, leading to spoiled bulbs.
- Finally, some gardeners in Delaware ignore the role of garlic scapes in hardneck varieties. Failing to remove scapes can hinder bulb growth, causing smaller, less flavorful garlic at harvest time.
Frequently Asked Questions
What if I'm in a colder pocket of Delaware?
If you're in a colder pocket, adjust your planting window by starting garlic indoors a bit earlier and ensuring that you choose hardy varieties. Keep an eye on frost dates to protect your garlic from late frosts.
Can I still plant garlic in May?
Planting garlic in May is not advisable as it typically leads to poor bulb size and overall growth. Stick to the recommended planting window from mid-March to early April for successful garlic production in Delaware.
How do I know when to harvest my garlic?
You should harvest garlic when approximately 60-70% of the lower leaves have yellowed. If you wait too long, the outer wrappers may deteriorate, reducing quality and storage life of your garlic.
Is garlic resistant to pests?
Garlic can deter certain pests like aphids and spider mites, but it's important to monitor your plants regularly for signs of damage. Integrated pest management strategies will be most effective combined with garlic's natural properties.
How should I store my garlic after harvesting?
After harvesting, cure garlic by hanging it in a shaded, well-ventilated area for 3–6 weeks. Store cured garlic in a cool, dry place with low humidity to extend its shelf life and maintain flavor.
Keep Learning
City guides in Delaware
Other crops in Delaware
Typical fall sowing window for Garlic in Delaware: October 24 – November 14.