PlantFun
Plant Needs
Sunlight
Requires full sun for optimal growth and head formation.
Watering
Keep soil consistently moist but not waterlogged.
Temperature
Prefers cool weather; tolerates light frosts well.
Characteristics
- Leaves: Thick, fleshy, glaucous (bluish-green) leaves, often forming a dense rosette or head depending on the cultivar;
- Flowers: Cross-shaped (cruciferous) with four yellow petals, borne in racemes;
- Stem: Stout, unbranched or branched, becoming woody at the base in older plants;
- Fruit: A silique, long and narrow, containing multiple small, round seeds.
Care Guide
Watering
Water deeply 2-3 times a week during active growth.
Fertilization
Apply balanced organic fertilizer before planting.. Heavy feeders; require consistent nutrients.
Coffee Grounds and Eggshells：Mix used coffee grounds and crushed eggshells into the topsoil to provide gentle nitrogen and calcium, which helps prevent tipburn. Avoid applying too thickly to prevent mold.Pruning
- Remove yellowing or pest-damaged lower leaves to improve airflow;
- Harvest heads or leaves promptly to encourage further production (in loose-leaf varieties);
- Pull the entire plant after it bolts (goes to seed) unless saving seeds.
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: Non-toxic per ASPCA, though large amounts of raw leaves may cause mild gastrointestinal upset.
Humans: Generally safe and widely consumed as a vegetable.
Garden Uses & Culture
Culture: Historically a staple of European peasant diets, symbolizing resilience and sustenance through harsh winters.
Usage: Widely cultivated as a food crop (cabbage, broccoli, Brussels sprouts, kale); sometimes used as ornamental cabbage in fall landscaping.