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Entire healthy mature arugula plant in a real garden bed, showing growth habit and scale.Primary identification image. 20–30 cm tall, 15–20 cm wide at maturity.

Arugula

Eruca vesicaria subsp. sativa (Mill.) Thell.

Also called: Rocket, Roquette, Rucola

Family
Brassicaceae
Season
Cool-season annual
Best grown in
Portland, Oregon

A peppery salad leaf ready in four weeks; sow every two weeks in cool weather and expect bolting in heat.

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Life cycle & growth stages

  1. 1. SeedSow thinly, 5 mm deep.
  2. 2. SeedlingEmerges in 3–7 days.
  3. 3. Harvest readyLeaves 8–12 cm at 3–4 weeks.
  4. 4. HarvestCut 2 cm above the crown for regrowth.
  5. 5. BoltingWhite flowers in heat; edible but leaves turn hot.

Growth stages are ordered chronologically; timing varies with cultivar, temperature, light and care.

Planting calendar for Portland, Oregon

direct sow 4 weeks before to 3 weeks after last frost; 25–40 days to maturity from sowing. Windows are derived from the region's average frost dates (last Apr 5, first Nov 5) and are estimates until you confirm your own dates in the calendar.

ArugulaEruca vesicaria subsp. sativa
PlantStart indoorsDirect sowAutumn sowTransplantTendHarvest
Arugula—Mar 8–Apr 26 (estimate); Apr 26–Sep 27 (estimate)Sep 10–Oct 15 (estimate)——Apr 2–Nov 27 (estimate)
  • Direct sow: Mar 8 – Apr 26
  • Harvest: Apr 2 – Nov 27
  • Succession sow: Apr 26 – Sep 27
  • Autumn sowing: Sep 10 – Oct 15

Spacing & support

In-row 10–15 cm; rows 20–30 cm. Planner footprint: 1 cell of 30 cm, 4 plants per cell.

Side-profile diagram of mature arugula: canopy 20–30 cm tall, 15–20 cm wide, shallow root zone, support and harvest-access envelope.

Soil & water

Soil
Any moist soil
pH
6–7
Fertility
low
Water
Keep moist to slow bolting.
Frost
hardy; tolerates frost

Support & training

No support structure needed.

Arugula mid-season before harvest, showing branching, vining, rosette or upright habit and space occupied.

Harvest signs

  • Leaves 8–12 cm long
  • Before flower stems appear
Arugula at harvest readiness, showing the visual cues: leaves 8–12 cm long; before flower stems appear.

Common problems

Pests: flea beetles

Diseases: downy mildew

Appearance alone is not a diagnosis; confirm with a regional extension guide.

Side-by-side: healthy arugula leaf or fruit and an example of downy mildew.

Container growing

  • Minimum 3 L (12 cm deep)
  • Use quality potting mix and water more frequently
Mature arugula in a correctly sized container (3 L or more) with drainage visible.

Companion overview

1 reviewed relationship record (evidence: low).

Supported or conditional

None reviewed

Avoid or separate

None with evidence

1 popular pairing reviewed with no verified relationship.

Full companion profile

Crop rotation

Avoid planting arugula or other cabbage family crops in the same spot for 3 years. Rotation is about previous seasons, not about live neighbours.

Year 1Year 2Year 3BrassicaceaeOther familyOther familyback after 3+ years

Shared risks in Brassicaceae: clubroot, cabbage root fly, cabbage white caterpillars.

Crop rotation hub

Sources, reviewer & update

Sources

Reviewer: Garden Planner editorial team (pending independent horticultural review)

Last reviewed: August 15, 2026 · version 1

Found an error or have feedback? Let us know.

Growing arugula

Arugula is direct-sown from early spring and again in late summer, and is one of the best crops for autumn and under-cover winter harvests. In summer it bolts within weeks and turns fiercely hot.

Arugula seed beside a ruler or coin for scale.
Arugula seedling at cotyledon and first-true-leaf stage, in soil, distinguishable from common weeds.
Arugula mid-season before harvest, showing branching, vining, rosette or upright habit and space occupied.

Flea beetles are the main problem, peppering leaves with holes; mesh or a late-summer sowing after beetle peaks helps. As a brassica it counts toward rotation.

Two or more mature arugula plants with a tape measure showing in-row spacing (10–15 cm).
Arugula flower detail or bolting stage.
Immature leaves of arugula developing on the plant.

Arugula occupies little space and can be sown in gaps between slower crops or along bed edges; its shallow roots and low leaves rarely compete with neighbours. Left to flower, its white cross-shaped blooms are visited by hoverflies and small bees, so a few bolted plants are worth keeping at the end of a bed.

Edible parts and safety

Edible: leaves, flowers.

Hands or tool harvesting arugula correctly (cut, pull, twist or pick) without damaging the plant.

Pests and diseases

Common pests: flea beetles. Common diseases: downy mildew. These vary by region; a photograph is an example, not a diagnosis. See the pest and disease guides and your local extension service.

flea beetles on arugula, with a wider damage-context view.

Timeline

Season timeline for arugula: sowing, transplanting, flowering, harvest and bed occupancy aligned to frost dates.Text alternative: Direct sow Mar 8–Apr 26; Harvest Apr 2–Nov 27; Succession sow Apr 26–Sep 27; Autumn sowing Sep 10–Oct 15.

Related plants

See also: Brassicaceae family page · crop rotation · regional calendar · guides

Our Methodology & Sources

We synthesize peer-reviewed research, university extension publications, and trusted horticulture resources. Our evidence levels help you understand how strong the science is behind the guidance.

Evidence tiers

Supported evidenceConsistent results from multiple robust studies
Traditional claimHistorical use reported, limited scientific support
Context dependentMixed or variable results across conditions
No verified relationshipNo reliable evidence identified

Primary source types

  • Peer-reviewed journal articles
  • University extension publications
  • Government & research institute reports
  • Systematic reviews & meta-analyses

Last updated

August 24, 2026

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