Bryan McAllister’s personal reference notebook
July 30, 2026Short & citedBlog
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Field Notes • Plant

Kale

Kale is a dark leafy green cruciferous vegetable in the Brassicaceae family, related to cabbage, broccoli, and collard greens.

Updated July 30, 20261 min readCited sources

Kale is a dark leafy green cruciferous vegetable in the Brassicaceae family, related to cabbage, broccoli, and collard greens. It is eaten raw or cooked and is widely used in salads, soups, smoothies, sautés, and roasted dishes.

What it is

Kale is a leafy green vegetable in the cabbage family (Brassica oleracea, Acephala Group). Its leaves may be dark green or purple, and can be curly or flat. The edible part is the leaf; the central stem is tough and often removed before cooking.

Key details

Kale is nutrient-dense and low in calories, providing vitamins A, C, and K, along with fibre, calcium, potassium, iron, carotenoids, and other antioxidants. Cooking softens its texture and reduces bitterness. It can be steamed, sautéed, roasted, baked, or blended into smoothies. Raw kale is often massaged with dressing to make it more tender.

Why it matters

Kale is considered a healthy food because of its high vitamin and antioxidant content, though health effects depend on overall diet and portion size. It is widely available in Canada, popular in home gardens as a cool-season crop, and common in Canadian salads, soups, and seasonal dishes.

In short

  • Kale is a cruciferous leafy vegetable related to cabbage, eaten raw or cooked.
  • It is rich in vitamins A, C, and K, fibre, and antioxidants, and low in calories.
  • Cooking softens kale and reduces bitterness; the tough central stem is often removed.
  • Widely available in Canada and grown as a cool-season crop in home gardens.
Canadian angle

Kale is widely available in Canada and is commonly used in salads, soups, smoothies, and seasonal vegetable dishes. It is also a popular cool-season crop in Canadian home gardens and local produce markets.

Quick questions

Is kale healthy?
Kale is generally considered a healthy food because it is rich in vitamins A, C, and K, fibre, and antioxidants, and is low in calories.
How to cook kale?
Kale can be steamed, sautéed, roasted, baked, or added to soups and stir-fries. Many recipes remove the tough central stem first.
What is kale?
Kale is a leafy green cruciferous vegetable in the Brassicaceae family, related to cabbage, broccoli, cauliflower, and collard greens.

Sources

  1. BBC Good Food — https://www.bbcgoodfood.com/health/nutrition/health-benefits-kale
    Supports: Kale is a cruciferous vegetable with edible leaves; it can be eaten raw or lightly cooked; leaf shape and colour vary.
  2. Cleveland Clinic — https://health.clevelandclinic.org/kale-benefits
    Supports: Kale is a fibrous leafy green cruciferous vegetable in the Brassicaceae family.
  3. PubMed Central — https://pmc.ncbi.nlm.nih.gov/articles/PMC12610807/
    Supports: Kale is rich in vitamins, minerals, fibre, glucosinolates, polyphenols, carotenoids, flavonoids, and chlorophylls.
  4. Medical News Today — https://www.medicalnewstoday.com/articles/270435
    Supports: Kale contains fibre, antioxidants, calcium, vitamins C and K, iron, and other nutrients; it can be used in salads, soups, and smoothies.
  5. MedlinePlus — https://medlineplus.gov/ency/patientinstructions/000729.htm
    Supports: Kale can be eaten raw, added to smoothies, soups, stir fries, pasta, steamed, sautéed, or roasted into chips.
  6. Mayo Clinic Health System — https://www.mayoclinichealthsystem.org/hometown-health/speaking-of-health/the-many-types-and-health-benefits-of-kale
    Supports: Kale is nutrient-dense and can be steamed, stir-fried, roasted, eaten raw, blended into smoothies, or made into chips.