Arugula has long brought a peppery spark to Mediterranean kitchens, but the name is used for two related crops. Common arugula, Eruca vesicaria subsp. sativa, grows quickly, forms broader leaves, and has a milder, more tender flavor. Wild arugula, Diplotaxis tenuifolia, is slower-growing and more deeply lobed, with a sharper taste and a longer harvest season.
Both are cool-season leafy greens, though wild arugula tolerates heat and repeated cutting better than common arugula. Each produces its best leaves in fertile soil, steady moisture, and mild weather, before flowering makes the flavor stronger.
Growing Guide
Timing
Direct sow arugula about 3–5 weeks before the expected last spring frost, once the soil can be worked. It germinates readily in cool soil and may be ready for baby-leaf harvest in only a few weeks.
Make small sowings every 1–2 weeks while weather remains mild. Sow again in late summer for a fall crop. Warm temperatures and lengthening days encourage bolting and a stronger, more bitter flavor.
Sowing & Starting
Sow seeds about ¼ inch deep and keep the seedbed evenly moist until seedlings emerge. Space plants about 2–3 inches apart for baby leaves or 4–6 inches apart for larger plants.
Arugula is usually best direct sown because it grows quickly and establishes easily. Thin crowded seedlings early, using the extras in salads.
Growing & Care
Choose a site with full sun during cool weather. Light afternoon shade can help extend the harvest as temperatures rise.
Grow arugula in loose, well-drained soil enriched with finished compost. Its shallow roots need regular moisture to keep leaves tender and mild. Mulch lightly once plants are established to cool the soil and reduce weeds.
Harvesting
Choose a site with full sun during cool weather. Light afternoon shade can help extend the harvest as temperatures rise.
Grow arugula in loose, well-drained soil enriched with finished compost. Its shallow roots need regular moisture to keep leaves tender and mild. Mulch lightly once plants are established to cool the soil and reduce weeds.
Nutrition & Uses
Arugula provides fiber, folate, calcium, potassium, and vitamins A, C, and K. Like other members of the cabbage family, it contains naturally occurring glucosinolates.
Use the leaves fresh in salads, sandwiches, grain bowls, and pesto, or scatter them over pizza and roasted vegetables just before serving. Mature leaves can also be lightly wilted into pasta, soups, and egg dishes.
Pests & Diseases
Flea beetles are the most common problem and may leave many small holes in young leaves. Protect early sowings with insect netting where they are troublesome and keep plants growing steadily so they can outpace light damage.
Aphids, slugs, and caterpillars may also appear. Crop rotation, clean beds, good airflow, nearby flowers for beneficial insects, and watering near the soil help keep problems in balance.
Seed Saving
Arugula is an insect-pollinated annual and may cross with other varieties of the same species. Grow only one flowering variety nearby or provide generous isolation when preserving pure seed.
Choose several healthy, true-to-type plants and allow them to flower and form slender seedpods. When the pods turn tan and begin drying, cut the stalks before they split open.
Finish drying under cover, then thresh, clean, and store the fully dry seed in a labeled container in a cool, dark place.
