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Mammoth Red Rock Cabbage Seeds For Planting (Brassica oleracea)

Packet of 300 Seeds

Regular price $3.99

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Single Packet of 300 Seeds

Mammoth Red Rock is a large heirloom cabbage that was introduced in 1889. Known as Red Danish prior to 1906, this cabbage produces large, beautiful deep red-purple heads that have been a favorite among cabbage connoisseurs for years. According to the 1944 Steele & Briggs Seed Co catalogue, it is the “largest and best red cabbage.”

This easy to grow, low maintenance variety produces a uniformly round head that is 8 – 10” in diameter and weighs approximately 5 - 8 pounds. It has a small to medium core and grows to a height of around 11.7”. It stores well, reportedly loosing neither flavor nor crispness. The plants thrive in late season and can survive close to freezing temperatures, doubling their sugar content after one month of cold.

Mammoth Red Rock cabbage has a crisp sweet taste that works well in salads such as coleslaw. It is a favorite for pickling and can be stir fried as well as boiled. Foods that complement its flavor include apples and onions. A good recipe that combines the three is braised red cabbage with apples. Another simple to execute recipe combines this cabbage with onions and mushrooms accompanied by bass.

Pests and Disease

Pests to be aware of include the cabbage looper, diamondback moth, imported cabbageworm, flea beetle and cabbage root maggot. These can be controlled by crop rotation, weed control, straw mulch used as a ground cover and row covers. Companion planting with rosemary, sage, thyme and garlic deters pests. Chamomile attracts beneficial insects and improves flavor.

Diseases include black rot, club root, downy mildew and white mold. Methods for control include destroying crop debris after harvest, avoid overhead irrigation and keeping leaves dry, and allowing for good air circulation. Good companion planting for disease control includes lettuce which is resistant to downy mildew and will reduce the spread of spores.


The pigments that create Mammoth Red Rock's deep red-purple color are called anthocyanins. These antioxidants are known to reduce cholesterol and inflammation as well as improve immune function. This cabbage is also rich in vitamins A, C and K, though it loses some of its vitamin C content when cooked.

Sowing The Seed

Cabbage is a cool seasoned crop, which is well suited for the early Spring and early to late Autumn season. The seeds can be started indoors, or directly outdoors. If started indoors, sow in peat pots, 6 to 8 weeks prior to the last frost, at a depth of 1/4” under topsoil. Transplant into the garden, or direct sow outdoors, when the weather is slightly cool to warm. Check below for spacing and growth habits.

Growing Conditions

Cabbage plants, as explained above, will thrive in cooler temperatures. It is recommended to place them in an area of full sunlight, with temperatures averaging around 60F to 65F. The plants will need a soil that is rich in organic matter, but also well drained. If your sowing area is filled with hard, compact soil, we recommend adding in a light compost mix to improve drainage. Water the plants daily to ensure that the soil is kept moist until germination has occurred.

Germination & Growth

Cabbage seeds will typically take anywhere between 7 to 14 days to sprout open. The plants themselves will take up little garden space, and can be grown in rows. Each plant can be spaced about 18 to 24 inches apart from one another, in rows that are spaced about 24 to 30 inches apart. Fertilize when new leaves form, and when the heads begin to form. Harvest your Cabbage heads in roughly 90 to 100 days.

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