Arugula

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 (Eruca vesicaria subsp. sativa) is native to the Mediterranean basin, with wild populations found across southern Europe, North Africa, and western Asia. Archaeological evidence suggests it was cultivated in the eastern Mediterranean as early as the 1st century BCE. The Romans were the first to document arugula extensively — Pliny the Elder wrote about its cultivation in his Natural History, and the poet Virgil mentioned it in his works. Roman physicians prescribed arugula as a digestive aid and aphrodisiac, a reputation that persisted well into the Renaissance.

Throughout the Middle Ages, arugula fell in and out of favor across Europe. Italian and Middle Eastern cuisines maintained a continuous tradition of arugula cultivation, while northern Europe largely forgot about it. In Italy, rucola remained a beloved salad green and pizza topping for centuries, grown in kitchen gardens across the peninsula. The plant also spread eastward along trade routes, becoming established in Indian cuisine where it is grown for both its leaves and oil-rich seeds.

Arugula's modern global popularity began in the 1990s when it became a signature ingredient of the New American and farm-to-table restaurant movements. What was once an obscure European green became a mainstream supermarket staple within a decade. Today, arugula is commercially cultivated worldwide, with major production in Italy, Turkey, India, and the United States. California and Arizona lead American production, growing arugula year-round for the bagged salad market. The plant's rapid growth cycle, minimal input requirements, and bold flavor have made it one of the most popular specialty greens for both home gardeners and commercial growers.

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.

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.

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.

Arugula is a classic salad green, tossed with shaved Parmesan, lemon, and olive oil. Scatter over hot pizza or pasta as a fresh, peppery garnish. Blend into pesto as an alternative to basil. Add to sandwiches, wraps, and grain bowls. Wilt lightly into risotto, frittatas, and soups. Use as a bed for grilled meats, fish, or roasted vegetables. The edible flowers make a beautiful, mildly spicy garnish.