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Colza

Brassica napusfam. Brassicaceae
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medicinaledibleannual, biennialannualculinaryedibleedible leafedible seededible stemherbmedicinal
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Brassica napus (Colza) — botanical photograph
Pl. ABBD — Brassica napus
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I

Overview

Colza, scientifically known as Brassica napus, is a hardy annual or biennial forb/herb native to France. This plant thrives in full sun to partial shade and prefers moist soil that can be light (sandy), medium, or heavy (clay). Colza grows up to 1.2 meters tall and is adaptable to various climates, with a hardiness range of zones 6-9. Its edible parts, including leaves, seeds, and stems, make it a versatile plant both in the kitchen and as an ornamental. Colza is also cultivated for its edible seeds, which can be used as a substitute for rapeseed oil. While traditional sources suggest using colza as a tincture for after-meal comfort, PlantSage presents this information for context and not as medical advice. Colza's adaptability and diverse uses make it a valuable plant in many growing contexts.

Quick answers

What is Colza?

Colza, scientifically known as Brassica napus, is a hardy annual or biennial forb/herb native to France. This plant thrives in full sun to partial shade and prefers moist soil that can be light (sandy), medium, or heavy (clay). Colza grows up to 1.

What is Colza used for?

Traditionally used for digestion. Each claim is evidence-rated — see Section II for full citations.

Compare with:Coleseed→Narrow Leaved Peppergrass→Rape→all comparisons →
Best for
Top 1 evidence-ranked use of Colza
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Clinicaluses · safety · chemistry · dosagemedicinal profile
II

Benefits & evidence

1 claim · traditional-use context
Traditional-use context
These notes are presented as ethnobotanical context. No cited clinical references are catalogued for this plant yet.
  • Traditional-use note: Colza appears in herbal sources around after-meal comfort traditions, often as a tincture. PlantSage presents this as ethnobotanical context, not as medical advice.

    Traditional context only. This reviewed claim keeps the original low confidence level, but avoids treatment, disease, dosage, or guaranteed-effect language.

    ▲ LimitedDigestion →
IV·b

Mixology suggestions

1 draft
Editorial drafts. These pairings are AI-suggested from traditional herbal lore. Always verify with a qualified herbalist before brewing.
Colza support blend
general
tea
AI returned a direct ingredient list; normalized into one draft blend for editorial review.
Growingconditions · propagation · uses
V

Cultivation

Colza thrives in full sun to partial shade and requires moist soil that can be light (sandy), medium, or heavy (clay). It is hardy in temperate regions with a range of zones 6-9. Colza prefers a pH between 6 and 7.2. For best results, ensure the soil remains consistently moist while avoiding waterlogged conditions. This annual or biennial plant can grow up to 1.2 meters tall and produces edible parts including leaves, stems, and seeds. Skip if growing in zones outside its hardiness range.
Light
Full sun, Partial sun/shade
Water
Moist
Soil
Light (sandy), Medium, Heavy (clay)
Hardiness
6-9
Life cycle
Annual, Biennial
Habit
Forb/herb
Mature size
1.2 m tall
Soil pH
6–7.2
For first-time growers

How to grow Colza for the first time

8steps

Start with simple soil preparation and direct sowing for a straightforward beginner project.

  1. 1

    What you'll need

    Colza seeds, garden tools like a rake and trowel, compost or well-rotted manure.

  2. 2

    Best time to plant

    Plant in early spring for summer harvest or late summer for fall/winter harvest.

  3. 3

    Soil and container prep

    Prepare soil by loosening it with a rake. Ensure the pH is between 6 and 7.2.

  4. 4

    Sowing or transplanting

    Direct sow seeds 1 cm deep, spacing them about 30 cm apart in rows 45 cm apart.

  5. 5

    First two weeks

    Keep the soil moist by watering regularly. Thin seedlings to ensure they have enough space.

  6. 6

    Ongoing care

    Water when the top inch of soil feels dry, and mulch around plants to retain moisture.

  7. 7

    Harvest or pruning

    Prune any yellowing leaves to encourage new growth. Harvest seeds when they turn brown.

  8. 8

    Common mistakes

    Overwatering, planting too close together, neglecting to mulch.

VI

Edible & utility

Edible parts:LeavesSeedStem
Edible uses: Oil, Condiment
Other uses:Cover cropoil
Contextrange · companions · related
VII

Distribution

1 native · 134 introduced
Distribution across4 continents· 1 native· 134 introduced
Europe13 regions
native (1)France
introduced (12)AlbaniaBelgiumBulgariaFranceGermanyGreeceItalyNorwayPortugalRussiaSpainUkraine
Asia12 regions
introduced (12)AfghanistanBangladeshChinaGeorgiaIranIraqJapanPakistanPalestineSaudi ArabiaSouth KoreaYemen
Americas9 regions
introduced (9)BoliviaColombiaCosta RicaCubaDominican RepublicGuatemalaHaitiPuerto RicoUnited States
Africa8 regions
introduced (8)AlgeriaEthiopiaKenyaLibyaMaliMauritiusMoroccoTunisia
Broader regions
introduced:Alabama, Alberta, Altay, Amsterdam-St.Paul Is, Argentina Northeast, Argentina Northwest, Arizona, Arkansas, Baltic States, British Columbia, Buryatiya, California, Chile Central, Chile South, Colorado, Connecticut, Crozet Is., Czechoslovakia, Delaware, District of Columbia, Falkland Is., Florida, Galápagos, Idaho, Illinois, Indiana, Iowa, Juan Fernández Is., Kentucky, Kerguelen, Krasnoyarsk, Labrador, Louisiana, Maine, Manitoba, Marshall Is., Maryland, Masachusettes, Massachusetts, Michigan, Mississippi, Missouri, New Brunswick, New Hampshire, New Jersey, New Mexico, New South Wales, New York, New Zealand North, New Zealand South, Newfoundland, Norfolk Is., North Carolina, Northwest Territorie, Nova Scotia, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, Primorye, Prince Edward I., Québec, Queensland, Réunion, Rodrigues, Saskatchewan, South Australia, Tasmania, Tennessee, Transcaucasus, Utah, Vermont, Victoria, Virginia, Washington, West Himalaya, West Virginia, Wisconsin
IX

Specimen gallery

1 image
Brassica napus (Colza) — botanical photograph
Colza (Brassica napus)
X

See also

8 related

Plants you might compare or use together — scored by shared family (Brassicaceae), common use cases, and growing requirements.

XI

Explore further

Companion planting
Growing zone
Native to
XII

About this entry

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