Vegetable · Brassicaceae
Arugula
Eruca vesicaria subsp. sativa
Drop seed during cool weather and peppery leaves will be ready to cut in about a month.
Full sun
Every 2–3 days
41–77°F · 5–25°C
40–50 days
Overview
Arugula is the quick, peppery green for a gardener short on patience. It sits within the cabbage family, kin to broccoli and mustard, and that lineage is the source of its sharp, mustardy bite. Lay down a short row and leaves come ready for the basket about 4 to 6 weeks later.
At its core this is a cool-season crop. The plant performs best through the gentle spells of spring and fall, when its leaves stay soft and faintly nutty. Force it through midsummer heat and it bolts, raising a flower stalk while the leaves toughen and sour.
Hardly any green demands less. Arugula settles into a garden bed or a shallow windowsill pot just the same, breaks ground within days, and keeps producing as long as you pluck the outer leaves and sow a fresh row every week or two.
Care
The short version: full sun with maybe a bit of afternoon shade, soil held evenly moist, and cool air to keep the leaves gentle. Sow shallowly, pull the outer leaves often, and lay a new row every week or two.
Light
Through spring and fall, while the air stays cool enough to please it, arugula wants full sun. When heat sets in, a place shaded through the afternoon eases the rush to bolt and holds the leaves milder for a longer run.
Water
Hold the soil evenly moist and water every 2 to 3 days when conditions turn dry. Allow it to parch and the plant grows stressed, which tips it toward an early bolt and toughens the leaves into bitterness.
Soil
Set it in rich, well-drained loam with a good helping of organic matter mixed through. A pH falling between 6.0 and 7.0 fits it, and ground that stays moist without turning to muck keeps the leaves fast and tender.
Temperature
Cool air keeps arugula thriving, somewhere between 41°F and 77°F (5°C to 25°C). A light frost rolls off it without harm, while heat is the foe that drives it to flower and turns the flavor harsh.
Humidity
Plain outdoor air agrees with it, near 40% to 70% humidity, so the number deserves no worry. What sits in the soil matters far more to arugula than what hangs in the air.
Feeding
Mix a nitrogen-rich balanced fertilizer or compost into the bed as you plant, and a fast crop like this rarely needs anything beyond that. Soil in good shape at the start carries the leaves all the way to picking a few weeks on.
Pruning
Take the outer leaves often so the center keeps pushing new ones up. The moment a flower stalk shoots from the middle and bolting sets in, stop and gather what remains before the taste turns sharp.
Repotting
Treated as an annual, arugula is resown each season rather than moved up a pot size. For a container, choose one at least 4 to 6 inches deep and start fresh seed every round instead of nursing along a spent plant.
Size & spacing
These plants keep low, reaching from 8 to 36 inches (20 to 91 cm) tall, with the flower stalk pushing toward that top figure. Thin or set seedlings about 6 inches apart to give each one room for a full rosette of leaves.
When to plant
Cool air, not the summer on the calendar, governs arugula. Direct sow the instant the soil can be worked in early spring, sow once more in late summer for an autumn picking, and leaves will be ready to cut about a month past each sowing. Steer clear of the hottest weeks, when the plant bolts nearly the moment it surfaces.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: 4-6 weeks before the last spring frost (optional; direct sowing preferred)
- Plant: Direct sow in early spring as soon as soil can be worked, then again in late summer for a fall crop
- Harvest: Leaves harvestable about 4-6 weeks after sowing, mainly in cool spring and fall
Hardiness
USDA hardiness zones: 2–11
Temperature: down to -46°C
Troubleshooting
Trouble with arugula is rare and quick to spot. Bolting in heat is the headline, and a few familiar insects fill out the rest. Find the match below and act early, while the leaves still earn a place on the plate.
A slim flower stalk rises and the leaves sharpen
What you see is bolting, the moment the plant trades leaf-making for seed-making, and warm air paired with long summer light triggers it. The fresh growth that follows comes in thin and stinging on the tongue. Cut every leaf still worth eating, lift the bolted plant by the roots, and start another sowing in a cooler corner.
Fix:
- Harvest all usable leaves promptly before they turn bitter
- Pull bolted plants and start a fresh succession sowing
- Move new sowings to a cooler or partly shaded spot
A scatter of tiny round punctures across each leaf
Each pinprick comes from flea beetles, little dark specks that spring out of sight the second your hand grazes the foliage. The tender seedlings suffer most. Drape floating row cover over the bed from sowing day onward, and snip the quick leaves while they are still clean.
Fix:
- Cover plantings with floating row cover at sowing
- Harvest quickly-maturing leaves before damage accumulates
Soft tacky clumps gathered along the tender shoots
Green or gray bunches packed onto the leaf undersides and the youngest stems point to aphids, and they leave a glossy, sticky coating behind. Blast them loose with a forceful jet of water, then strip away any leaf buried under them. A standing crew of beneficial bugs tends to settle the rest.
Fix:
- Rinse colonies off with a strong spray of water
- Remove and discard heavily infested leaves
Toxicity
Arugula is a salad green start to finish, safe for people and pets alike. Not a single part carries a toxin, so it can share space freely with cats, dogs, rabbits, and inquisitive children. All it asks in return is to be eaten.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Nothing in these leaves can hurt a cat, so the plant sits safely beside one. A small bite may stir a touch of stomach upset, as any unfamiliar green can, yet the actual danger is none.
Dogs None
With no toxins present, a nosy dog can sniff and gnaw the foliage freely. A heavy mouthful of any leafy green might loosen its stomach briefly, and that marks the limit of the concern.
Horses Safe
Not one part of arugula threatens a horse. Like other lush greens, it suits a small offering better than a fixed place in the daily ration.
Rabbits Safe
The leaves are fine for rabbits, and plenty take to the peppery snap. Serve it sparingly beside the greens they already get.
Livestock Safe
Goats, sheep, and cattle can browse arugula safely. The leafy green sits well within a mixed graze and does no harm.
Birds Safe
Backyard hens and other birds can peck at the foliage with no risk, and it brings a little change to what they eat.
People Safe
This green exists to be eaten. The leaves drop raw into salads or soften under heat in cooked dishes, and no part of the plant calls for caution.
Safe to grow around pets and children; the leaves are edible raw.
Varieties
Plain salad rocket fills most arugula seed packets, though a handful of named selections earn attention for their flavor and their staying power in heat.
Astro
Quick to mature with a gentle taste, this one resists throwing a flower stalk far longer than the rest, so it forgives a warm stretch.
Roquette
The classic heirloom rocket, carrying the deeply lobed leaves and the bold peppery snap that comes to mind at the word arugula.
Wasabi
Selected for a fierce horseradish-style heat, this variety burns hotter on the tongue than other rockets do.
Companions
Plant near
Bush beans: Beans fix nitrogen and their canopy shades the bed, helping cool-loving arugula stay productive and delay bolting.
Lettuce: Shares arugula's preference for cool, moist conditions and interplants well in the same cool-season bed.
Root crops (beets and carrots): Listed as compatible interplanting partners that use different soil layers, allowing efficient use of cool-season bed space.
How to propagate
Seed is how arugula gets going and very little else, one reason the crop stays so easy to keep on hand.
SeedEasy
Direct sow in early spring and again in late summer/fall · Germinates in about 5-7 days; seedlings established within 2-3 weeks
Seed is nearly the only way arugula gets started. Sprinkle it just under the surface of the bed in early spring, then once more in late summer for an autumn picking, and the sprouts push through in about 5 to 7 days. Once the seedlings have found their footing across 2 to 3 weeks, thin them to about 6 inches apart, and tuck in a short fresh row every week or two for a steady run of leaves.
Myths
Arugula is naturally bitter and unpleasant to grow.
Heat and bolting put the sting in the leaves, not the plant's own nature. Leaves picked young in the cool of spring or fall taste mild and nutty, nothing like the harsh greens left to languish through a hot summer.
Arugula is hard to grow from seed.
Few greens come up faster or with less fuss. Seeds sprout within days and the leaves are ready to cut in roughly 40 to 50 days, making it a fine first crop for anyone new to the garden.