How to Grow Arugula

What Arugula Is

Arugula, also sold as rocket or roquette, is a fast-growing leafy green in the cabbage family grown for its peppery, nutty leaves. It is used at two stages: baby leaves cut young for tender salad mixes, and larger mature leaves with more bite for cooking and bold salads. Flavor tracks conditions closely; cool weather and steady moisture keep it pleasantly spicy, while heat and drought push it toward harsh and bitter.

Because it is a brassica, arugula shares pests and soil diseases with cabbage, broccoli, and their relatives. Cornell's guide specifically advises avoiding planting it after other cabbage-family crops, so give it a spot in your rotation away from last season's brassicas.

When to Plant

Arugula is a classic cool-season crop. Cornell says to plant as soon as the soil can be worked in spring; seed germinates at soil temperatures of 40 to 55 F, far colder than most vegetables will tolerate, and seedlings emerge in 5 to 7 days. That means arugula can go in weeks before your last frost with no protection.

The crop's weakness is heat: warm weather and long days push plants to bolt into flower, and UF/IFAS Extension notes that temperatures above 85 F are the danger zone, recommending shade at that point. In hot-summer climates arugula becomes a spring and fall (or, in the Deep South, fall-through-spring) crop; UF/IFAS suggests sowing every two weeks from early fall through late spring in Florida. Frost is far less of a threat than heat, since arugula tolerates light freezes.

Sun, Soil, and Water

Arugula is unfussy about site by vegetable standards. UF/IFAS notes it grows in partial sun to full sun with about 4-6 hours of direct light per day, and that some afternoon shade actually helps delay bolting in warm weather. It wants well-draining soil enriched with organic matter; heavy, waterlogged clay is the main soil to avoid.

Consistent moisture is what keeps the leaves mild and the plants from bolting early. UF/IFAS advises watering when the top inch of soil feels dry, while noting arugula prefers slightly drier conditions than other salad greens, so aim for evenly moist rather than saturated. A stressed, thirsty planting turns hot-flavored and runs to seed; a steadily watered one gives you weeks of tender picking.

Sowing, Spacing, and Succession

Direct-sowing is the standard method; arugula grows so fast that transplants rarely earn their keep.

Cornell also notes arugula seed stores well; saved seed remains viable for about 5 years, so one packet can cover many seasons of succession sowing.

1. 1Sow shallow and close — Plant seed 1/4 inch deep and about 1 inch apart in rows, or broadcast it alone or mixed with other salad greens (Cornell).
2. 2Thin as it grows — Gradually thin to 6-inch spacings, eating the thinnings as baby salad. UF/IFAS similarly recommends final spacing of 6-8 inches for good air circulation.
3. 3Resow on a schedule — Make a new planting every 2 to 3 weeks for continuous supply, continuing until about a month before your average first fall frost (Cornell).

Care and Beating Bolting

Between sowing and harvest there is little to do beyond weeding and watering. Keep young stands weeded so the quick, shallow-rooted seedlings are not outcompeted, and maintain even moisture as described above. No heavy feeding is needed for a crop this quick in decent garden soil.

Bolting is the main event to manage. Once a flower stalk rises, leaves turn increasingly harsh. Slow it by sowing at the right season, keeping plants watered, and providing some shade for warm-season plantings, which is Cornell's specific recommendation. When a patch does bolt, pull it, resow, and note that the flowers themselves are edible and peppery. Treat each sowing as disposable; the next one is only a few weeks behind.

✔ Do not fight a bolted patch. With a 2-3 week succession rhythm, the correct response to bolting is always the same: pull it and move on to the next sowing.

Harvesting

Arugula is ready fast; Cornell says leaves can be harvested as early as 4 weeks after seeding. For salads, UF/IFAS suggests picking leaves at around 2-3 inches long, taking the outer leaves first and leaving the inner ones to continue growing. Handled this way, a single sowing yields several pickings before quality declines.

You can also treat arugula as a cut-and-come-again crop, shearing a patch an inch or so above the crown and letting it regrow for another cut or two. Whichever method you use, harvest in the cool of the morning and refrigerate promptly; the leaves are thin and wilt quickly.

Common Problems

Arugula's problems are mostly the cabbage family's usual suspects at miniature scale. UF/IFAS lists aphids and caterpillars among common threats, and flea beetles, which pepper brassica leaves with small round holes, are a frequent complaint on young stands. Because the crop is in the ground only a few weeks, floating row cover laid over the bed at sowing solves most of this without any spraying.

Cultural prevention does the rest: rotate away from beds that recently grew other cabbage-family crops (Cornell), thin to proper spacing for airflow, and keep plants growing quickly with steady water. Most 'problem' arugula is really just stressed or overmature arugula, so if quality drops, check your timing and watering before blaming pests.

Sources

Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.

• Cornell Garden-Based Learning — Arugula growing guide — Sow 1/4 in deep, 1 in apart, thin to 6 in; germination at 40-55 F with emergence in 5-7 days; harvest as early as 4 weeks after seeding; succession sowings every 2-3 weeks until about a month before first frost; plant as soon as soil can be worked; shade warm-season plantings; avoid planting after cabbage-family crops; seed viable about 5 years
• UF/IFAS Extension Leon County — Arugula: Planting and Care — Optimal temperatures 50-65 F; bolting risk above 85 F; tolerates light freezes; partial to full sun, about 4-6 hours per day; 6-8 in spacing; water when top inch of soil is dry; harvest outer leaves at 2-3 in long; sow every two weeks from early fall through late spring in Florida; aphids and caterpillars as common pests

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