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Red cabbage
Red cabbage plant
Species	Brassica oleracea
Cultivar group	Capitata Group

Red cabbage, cooked, boiled, drained, without salt

Nutritional value per 100 g (3.5 oz)
Energy	122 kJ (29 kcal)
Carbohydrates	6.94 g
Sugars	3.32 g
Dietary fibre	2.6 g
Fat	0.09 g
Protein	1.51 g
Vitamins and minerals Vitamins Quantity %DV† Vitamin A equiv. beta-Carotene 0% 2 μg 0% 20 μg Thiamine (B1) 6% 0.071 mg Riboflavin (B2) 5% 0.06 mg Niacin (B3) 2% 0.382 mg Pantothenic acid (B5) 3% 0.154 mg Vitamin B6 13% 0.225 mg Folate (B9) 6% 24 μg Vitamin C 38% 34.4 mg Vitamin K 40% 47.6 μg Minerals Quantity %DV† Calcium 3% 42 mg Iron 4% 0.66 mg Magnesium 4% 17 mg Phosphorus 3% 33 mg Potassium 9% 262 mg Zinc 2% 0.25 mg
Other constituents	Quantity
Water	91 g
Link to USDA Database entry
†Percentages estimated using US recommendations for adults,[1] except for potassium, which is estimated based on expert recommendation from the National Academies.[2]

Wikibooks Cookbook has a recipe/module on

• Cabbage

The red cabbage (purple-leaved varieties of Brassica oleracea Capitata Group) is a kind of cabbage, also known as Blaukraut after preparation. Its leaves are coloured dark red/purple. However, the plant changes its colour according to the pH value of the soil due to a pigment belonging to anthocyanins.^[3]

In acidic soils, the leaves grow more reddish; in neutral soils, they will grow more purple, while an alkaline soil will produce rather greenish-yellow coloured cabbages. This explains the fact that the same plant is known by different colours in various regions. It can be found in all of Europe, throughout the Americas, in China, and especially in Africa.

The juice of red cabbage can be used as a homemade pH indicator, turning red in acid and green/yellow in basic solutions. When cooking, red cabbage will normally turn blue; adding vinegar or acidic fruit to the pot is necessary to retain the cabbage's red colour.^[4]

Red cabbage needs well-fertilized soil and sufficient humidity to grow. It is a seasonal plant that is seeded in spring and harvested in late autumn.^[5] Red cabbage is a better keeper than its "white" relatives and does not need to be converted to sauerkraut to last the winter.

It is recommended to start red cabbage seeds indoors four weeks before the last frost. Sow in containers that allow for the movement of water through the bottom of a cell. Popular seedling starting containers are peat pots, egg cartons, plug trays, or milk cartons. Once the seedlings grow to about 5 centimetres (2 inches) tall and have developed their first leaves, they can be hardened off and moved outside for transplanting.

Red cabbage prefers climates that remain moist and cool for most of its vegetative growth stage, so it can be placed in the ground shortly after the last frost while the spring is still cool. The cabbage plants can be spaced about 30–65 cm (12–26 in) from one another. They will need watering often but are otherwise low-maintenance plants.^[8]

Wikimedia Commons has media related to Brassica oleracea var. capitata f. rubra.

• How to Make Red Cabbage pH Indicator Archived 14 July 2011 at the Wayback Machine
• How to extract the dye