Arugula is the fastest salad crop you can grow: sow it on a Monday and you can be eating it within a month. Its peppery, nutty leaves lift any salad, top a pizza beautifully, and wilt into pasta in seconds. It is the green that turns a plain meal into something interesting.
It takes just 30–45 days to mature and it is hardy, so it is a spring and autumn crop, sown in succession every few weeks. It grows fast, it bolts fast in heat, and it is at its best picked young and often.
Arugula at a glance
| Growing factor | What arugula need |
|---|---|
| Sun | full sun |
| Soil pH | 6.0–7.0 |
| Days to germination | 7–10 |
| Days to maturity | 30–45 |
| Spacing | 6–8 inches |
| Water needs | moderate |
| Cold tolerance | hardy |
| Family | Brassicaceae |
Starting seeds
Arugula are direct-sown outdoors — they do not transplant well, so start them where they will grow. Sow the seed at the depth on the packet, in rows spaced for the mature plant, and keep the seedbed evenly moist until seedlings appear, which takes 7–10 days.
Because the seed goes straight into the garden, timing matters more than with transplants: sow too early into cold, wet soil and germination stalls, sow too late and the plants run out of season. Use our frost-date calculator and the hardiness-zone finder to place your sowing window, and check your local extension service for the dates that fit your area.
Arugula is direct-sown, with germination in 7–10 days. Sow thinly in shallow drills, barely covering the seed, and keep the soil moist until seedlings appear. Sow in early spring in Zones 3–6, in late winter to early spring and again in late summer in Zones 7–9, and in autumn and winter in Zones 10–11; in frost-free Zones 11–13 sow in the cool season. For a continuous supply, sow a short row every two weeks — a big sowing all matures at once and bolts together.
Transplanting and planting out
Arugula is not transplanted — it grows too fast for it to be worth the trouble, and the roots dislike disturbance. Thin seedlings to 6–8 inches apart once they are a few inches tall, and eat the thinnings. Because the plants are small and fast, keep the bed weed-free by hand while they establish. Arugula also grows well in pots and window boxes, where it is easy to keep watered and shaded.
When you set plants out, space them 6–8 inches apart — that spacing is what the mature plant needs, and crowding is one of the commonest causes of small harvests. Our plant-spacing calculator works out how many plants fit your bed, and the square-foot garden planner can lay the bed out for you. Harden seedlings off for a week before planting out, moving them outside for longer each day, and plant on a cloudy day or in the evening so they do not wilt in their first hours outdoors.
Soil and feeding
Arugula wants fertile, moisture-retentive soil at pH 6.0–7.0, with compost dug in before sowing. It is a quick crop, so a little balanced fertiliser at sowing time is all it needs — it will be harvested before it wants a second feed. A fine, crumbly seedbed gives the best germination, and like all brassicas it should not follow another brassica in the same bed.
Aim for a soil pH of 6.0–7.0 — a simple soil test will tell you where you stand, and garden lime or sulfur can nudge pH up or down over a season. Feed lightly and steadily rather than in one heavy dose: too much fast nitrogen late in the season pushes leafy growth at the expense of the part you eat. Our fertiliser calculator works out amounts for your bed size, and the raised-bed soil calculator and soil-volume calculator tell you how much mix a new bed needs. A mulch layer after planting keeps the soil moist and cool and feeds the soil as it breaks down.
Watering
Water needs are moderate: keep the soil evenly moist through the growing season, watering deeply when the top inch or two dries out. Deep, infrequent watering builds deeper roots than a daily sprinkle, and it keeps the plants steady through dry spells.
Water needs are moderate, but arugula must not dry out — drought makes it bolt and turns the leaves fiercely peppery and tough. Water little and often, keeping the soil moist, especially in the first weeks after germination. Mulch between rows to hold moisture in, and water in the morning so the leaves dry during the day.
Water at the base of the plant, in the morning, so the leaves dry quickly and the water reaches the roots instead of evaporating off the surface. A soaker hose or drip line is ideal. Our watering calculator gives a starting point for your bed size and soil, and the watering schedule generator can build a routine around it. Mulch is your best friend here: a few inches of straw or shredded leaves cuts evaporation and keeps moisture even between waterings.
Sunlight and temperature
Arugula needs full sun in cool weather for the fastest growth, but it is a cool-season crop — heat is what ends the harvest. It is hardy, so spring and autumn sowings take light frosts in their stride, and a little afternoon shade in a warm spring slows bolting noticeably. In Zones 8–10 it grows through winter; in frost-free Zones 11–13 grow it in the coolest months only.
This crop is rated hardy for cold tolerance, so plan your season around that: hardy and frost-tolerant crops can be sown and harvested around frosts, while tender crops need warm soil and frost-free nights. Our sunlight calculator can check whether your spot gets enough sun through the season, and the hardiness-zone finder will confirm your zone. If your summers run very hot, afternoon shade or a shade cloth can keep a cool-season crop productive for a few extra weeks.
Pests and diseases
Arugula has few pest problems, and most trouble comes from heat rather than insects. The ones to expect are cabbage worms, aphids, flea beetles and slugs.
- Cabbage Worms — green caterpillars that chew holes in leaves. Pick them off by hand and grow under fine mesh.
- Aphids — cluster on young leaves. Wash them off with water and encourage ladybirds.
- Flea Beetles — tiny beetles that pepper young leaves with shot-holes. Keep seedlings covered and watered — vigorous plants outgrow the damage.
- Slugs — chew young seedlings in damp weather. Pick them off at dusk and keep the bed clear of debris.
Inspect plants weekly, especially the undersides of leaves, and act early — a small problem caught in time is a hand-picked handful of pests, while a late one can cost the crop. Row cover keeps many flying pests off young plants, and healthy, well-watered plants resist attack far better than stressed ones. If you need help identifying what you are seeing, our pest-identifier helper and plant-disease checker walk through the symptoms.
Companion plants
Arugula grows well with marigolds, basil, onions and lettuce — it is a natural salad-bed companion, sharing a cool season and a short growing period with lettuce. It makes good use of the ground between slower crops, filling gaps while they establish, and its peppery scent is said to deter some pests. As a brassica, it should not follow another brassica in the same bed.
Good companions for arugula include:
- Marigolds
- Basil
- Onions
- Lettuce
Our companion-planting finder can suggest more pairings for your bed plan. As a general rule, avoid planting members of the same family (Brassicaceae) in the same spot year after year — rotate beds so soil-borne problems do not build up.
Harvesting
Start picking leaves once they are a few inches long, from about 30 days after sowing — pick the outer leaves and leave the centre growing, and the plant will keep producing for weeks. Young leaves are mild and tender; older leaves are hotter and better wilted into cooking. Pick little and often, and always before the plant bolts — once it flowers, the leaves turn tough and bitter, though the flowers themselves are edible and pretty in salads.
Expect the crop to be ready about 30–45 days after sowing, though weather and variety shift that window by a week or two either way. Our harvest-date calculator works out your expected harvest date from your sowing date, and the vegetable-yield estimator can estimate how much a bed should produce. Harvest in the morning when plants are cool and crisp, and use a sharp knife or secateurs rather than tearing, which damages the plant and invites disease.
Common problems and fixes
| Problem | Likely cause | Fix |
|---|---|---|
| Bolting to seed | heat or long days | Sow in cool weather; pick young and often. |
| Leaves too hot and tough | drought or harvesting too late | Water well and pick leaves young. |
| Flea beetles peppering the leaves | beetles attacking young plants | Grow under fine mesh and keep plants watered. |
Bolting to seed
Likely cause: heat or long days Arugula bolts fast in heat and long summer days. Sow in spring and autumn, not midsummer, give it a little afternoon shade, and pick the leaves young — a bolted plant is finished, so sow the next row.
Leaves too hot and tough
Likely cause: drought or harvesting too late Arugula's pepperiness increases with drought and age. Keep the soil moist, pick leaves when they are young and tender, and wilt the older, hotter leaves into cooking, which mellows them.
Flea beetles peppering the leaves
Likely cause: beetles attacking young plants Tiny shot-holes in young leaves are flea beetles. Cover seedlings with fine mesh and keep them growing fast — vigorous plants outgrow the damage.
Frequently asked questions
How long does arugula take to grow?
Just 30–45 days from sowing to first pick — one of the fastest vegetables you can grow. You can start eating the thinnings even sooner.
Why did my arugula bolt?
Heat or long days — it is a cool-season crop and bolts fast in summer. Sow in spring and autumn, give it afternoon shade, and pick young and often.
Can I grow arugula in a pot?
Yes — it is ideal for containers and window boxes. Sow thickly, keep it watered, and cut the leaves young.
Why is my arugula so peppery?
Drought and age increase the bite. Water well, pick young leaves, and wilt older ones into cooking to mellow them.
How often should I sow arugula?
Every two weeks in spring and autumn, so you always have a young row coming ready. They mature in just 30–45 days.