When to Plant Arugula in Delaware (2026 Guide)
Arugula is a delicious and quick-growing leafy green that's perfect for home gardens in Delaware. With its distinctive peppery flavor, it thrives during the state's cooler seasons. Gardeners can take advantage of the frost-free periods, extending the growing season for their crops and ensuring a steady supply of this nutritious green for salads and garnishes.
In Delaware, the timing for planting arugula varies slightly between the two top USDA hardiness zones: Zone 6b and Zone 6a. Gardeners in Zone 6b should plan to plant their arugula 4–6 weeks before the median last spring frost date of April 10, while those in Zone 6a can start a little later, with the last frost on average occurring around April 18.
Understanding the frost dates helps you to maximize your arugula harvest. With a growing season of about 203 days in Zone 6b and 189 days in Zone 6a, Delaware's mild climate allows for multiple sowings. By planting arugula in spring and again in late summer, you can enjoy fresh greens from your garden almost year-round.
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 around April 25 – May 1 | Direct sow from April 10 – May 15 | Harvest from May 15 – June 30 |
| Zone 6a | Start March 1 – March 15, ~4–6 weeks before April 18 | Transplant outdoors around May 1 – May 5 | Direct sow from April 18 – May 25 | Harvest from May 25 – July 10 |
Arugula Planting Windows in Delaware
- Indoor start: For gardeners in Delaware, start arugula indoors between February 15 and March 15, depending on your USDA hardiness zone.
- Transplant outdoors: Transplant your arugula outdoors in Delaware around April 25 for Zone 6b and May 1 for Zone 6a.
- Harvest: Begin harvesting arugula in Delaware from May 15 in Zone 6b and May 25 in Zone 6a, enjoying fresh greens through early July.
Common Mistakes Growing Arugula in Delaware
- One common mistake Delaware gardeners make is sowing arugula too late in the spring. With the last frost in Zone 6b typically on April 10, planting too close to this date can lead to poor yields as temperatures rise and the plants bolt quickly.
- Ignoring the impact of humidity is another mistake. The high humidity in Delaware during summer months can stress arugula, leading to bolting. Gardeners should aim for crops that are resilient to these conditions and time their plantings accordingly to avoid the summer heat.
- Many first-time growers in Delaware underestimate the effects of coastal fog and late spring snows. These unexpected weather events can hinder germination and growth. Make sure to monitor local forecasts and adapt planting schedules to account for these climatic factors.
- Overcrowding plants is a common issue as well. Arugula needs proper spacing to flourish. Many gardeners, eager to maximize yield, plant too closely together, which can lead to stronger competition for nutrients and light, ultimately resulting in less successful harvests.
- Lastly, some vegetable growers believe arugula can withstand extreme temperatures as long as it is watered regularly. This is not entirely true. Excessive heat, common in Delaware, can cause arugula to bolt faster than expected, making it crucial to plant at appropriate times.
Frequently Asked Questions
What if I'm in a cold pocket of Delaware?
If you find yourself in a colder area, consider starting your arugula indoors a week or two earlier than suggested. This will allow you to get a head start on germination and subsequent transplanting, maximizing your growing season.
Can I still plant arugula in May?
While May is past the ideal sowing window for spring in Delaware, you can still plant arugula early in the month if you're in Zone 6a. However, be cautious of rising temperatures to prevent bolting.
How often should I harvest my arugula?
Harvest outer leaves when they reach about 3–4 inches tall. Regularly harvesting the leaves can keep plants productive and prevent bitterness. Aim to cut every week to ensure fresh additions to your salads.
Are there other plants I can grow with arugula?
Yes! Arugula pairs well with slower-growing plants like carrots or beets in the same bed. This way, the arugula can be harvested before the larger crops need more space, enhancing productivity throughout the garden.
What should I do if I see holes in my arugula leaves?
Holes in arugula leaves are usually a sign of flea beetle activity. To protect against these pests, cover young plants with floating row covers. This will minimize damage and help your leaves stay healthy and intact.
Keep Learning
City guides in Delaware
Other crops in Delaware
Typical fall sowing window for Arugula in Delaware: August 31 – September 21.