Arugula

A peppery, nutty salad green that grows rapidly and adds bold flavor to mixed salads, pizzas, and pasta dishes. Arugula is one of the quickest crops from seed to harvest, ready in as little as three weeks for baby leaf picking. It bolts fast in warm weather, developing stronger flavor and small white flowers that are also edible. Succession sow every two weeks and provide afternoon shade in warmer months for a milder-tasting, longer-lasting crop.

Direct sow outdoors 1/4 inch deep as soon as soil reaches 40°F in spring, typically 2-4 weeks before last frost. Seeds germinate in 3-7 days. Indoor starting is unnecessary due to the extremely fast growth rate. For baby greens, broadcast seed thickly; for full-sized plants, thin to 4-6 inches apart. Succession sow every 2-3 weeks through spring and again from late summer through fall. Seeds remain viable for 4-5 years when stored cool and dry.

Direct sow arugula seeds 1/4 inch deep outdoors as early as 2-4 weeks before the last frost. Seeds germinate in 3-7 days even in cool soil (40°F minimum). Thin seedlings to 4-6 inches apart for full-sized leaves or broadcast sow thickly for baby greens. Rows should be 8-12 inches apart. Succession sow every 2-3 weeks for continuous harvest.

Arugula thrives in cool weather between 45-65°F and bolts rapidly when temperatures exceed 75°F. In warm climates, provide afternoon shade and keep soil consistently moist to delay bolting. Arugula is relatively pest-free and requires minimal fertilization in decent soil. A light application of compost at planting is usually sufficient.

For a fall crop, begin sowing again in late summer. Fall-grown arugula is often the best quality, as cooling temperatures produce milder, more tender leaves. In mild winter areas (zones 8-11), arugula can be grown throughout the winter. Allow some plants to flower and set seed for natural self-sowing; arugula readily volunteers in subsequent seasons.

Arugula pairs well with carrots, lettuce, spinach, and beets as complementary salad garden companions. Its fast growth makes it an excellent interplanting partner between slower-growing crops. The peppery scent may help deter some pests from neighboring plants. Avoid planting near other brassicas to reduce shared pest pressure. Tall plants like tomatoes or corn can provide beneficial afternoon shade in summer to extend the arugula harvest season.

Arugula is undemanding about soil but grows best in fertile, well-drained soil with a pH of 6.0-7.0. Work in compost before planting for best results. Additional fertilization is rarely needed for this fast-growing crop. If soil is poor, a light application of balanced granular fertilizer at planting is sufficient. Avoid excess nitrogen, which can promote lush but bland-tasting growth. Consistent moisture produces the mildest, most tender leaves.

Ideal Temperature

Hardiness Zone Compatibility

Begin harvesting baby arugula leaves as early as 21 days after sowing, or wait 40 days for full-sized leaves. Cut leaves 1 inch above the soil for cut-and-come-again harvesting; plants will regrow 2-3 times. Harvest outer leaves individually or cut entire rosettes. Flavor is mildest when leaves are small (2-3 inches) and in cool weather. Larger, older leaves and those grown in hot weather have a stronger peppery bite. Flowers are also edible with a mild spicy flavor.

Storage & Preservation

Store unwashed arugula in a plastic bag lined with a paper towel in the refrigerator for 3-5 days. Arugula wilts quickly, so use promptly for best quality. It does not freeze or dry well due to its delicate texture. For longer preservation, make arugula pesto (blend with olive oil, garlic, pine nuts, and Parmesan) and freeze in ice cube trays for up to 6 months. Arugula oil can be made by blending leaves with olive oil and straining for a peppery finishing oil.

Troubleshooting Common Problems

Bolting is the number one challenge, triggered by heat, long days, and drought stress. Provide shade and consistent moisture in warm weather. Bitter, overly peppery leaves result from heat stress or delayed harvesting. Flea beetle damage is the most common pest issue; use row covers from the start. Overcrowding leads to leggy growth and poor air circulation. Self-sowing can become weedy if flowers are left to set seed; remove unwanted volunteer plants promptly.

Growing Tips

1. Succession sow every 2-3 weeks without fail — this is the single most important practice for continuous arugula production. A single sowing provides only 2-3 weeks of quality harvest before bolting, so staggered plantings are essential.
2. Provide afternoon shade in warm weather using shade cloth, tall companion plants, or strategic bed placement on the north side of taller crops. This simple step can delay bolting by 1-2 weeks and keep leaves mild-flavored.
3. Water consistently and never let the soil dry out completely. Drought stress accelerates bolting and produces intensely bitter, tough leaves. Mulch around plants to maintain even soil moisture between waterings.
4. Harvest early and often. Begin cutting baby leaves at 21 days and continue with cut-and-come-again harvesting at 2-3 cm above soil level. Regular harvesting stimulates new growth and delays bolting.
5. Broadcast sow thickly for baby greens rather than spacing plants precisely. A dense carpet of arugula can be harvested with scissors like a living salad bar, and the close spacing also suppresses weeds effectively.
6. Fall-sown arugula is almost always superior to spring crops — the cooling temperatures produce milder, more tender leaves with far less bolting pressure. Make fall your primary arugula season.
7. Let a few plants flower and go to seed at the end of each season. Arugula self-sows freely, and volunteer seedlings often appear in the same bed the following season with no effort required.
8. Interplant arugula between slow-growing crops like tomatoes, peppers, or brassicas. The arugula will be harvested long before the larger plants need the space, making efficient use of every square centimeter.