Danish Ballhead Cabbage Seeds

Danish Ballhead Cabbage — The Heirloom Built to Last All Winter

Danish Ballhead is the cabbage gardeners grow when they want to still be eating their own cabbage in February. Bred in Denmark and carried into North American gardens in the late 1800s, it produces tight, perfectly round blue-green heads of 4–7 pounds on a compact frame. What sets it apart from quick fresh-eating types is density: the heads are heavy for their size, low in moisture, and built to last four to six months in a cool root cellar without softening. That same density makes it one of the best sauerkraut cabbages available — dense, low-water heads ferment clean and crisp instead of going mushy.

This is a long-season variety at 100–110 days from transplant, so a single, well-timed planting is the whole game. Heads that mature into cooling autumn temperatures get denser and sweeter — Danish Ballhead actually rewards a late finish, converting starches to sugars after the first light frosts. If your goal is a full root cellar and a winter’s worth of kraut from one bed, this is the variety to build it around.

🌱 Sowing & Growing Danish Ballhead

Because it needs a long run to size up, most growers raise Danish Ballhead as a fall storage crop. Start seeds indoors 6–8 weeks before transplanting, sowing ¼ inch (6 mm) deep at 18–24°C (65–75°F); seedlings emerge in 5–10 days. Transplant out when plants are 10–15 cm (4–6 in) tall, spacing them a generous 45–60 cm (18–24 in) apart in rows 60–90 cm (24–36 in) apart — large storage heads need room and airflow to develop fully. In short-season zones, count back the full 100–110 days (plus a couple of weeks of head-fill buffer) from your first hard frost to set your transplant date; in much of the North that lands in late June or early July. Our complete guide to growing cabbage from seed has region-by-region timing.

Danish Ballhead is a heavy feeder. Work plenty of compost into the bed before planting and keep the soil pH near 7.0 — liming acidic soil is your single best defence against clubroot, the soil-borne disease that deforms brassica roots. To keep cabbage moths off the developing heads, interplant the aromatic herbs and flowers in our vegetable companion planting chart, and rotate brassicas on a three-year cycle.

🌿 Soil, Care & Watering

Give Danish Ballhead fertile, well-drained soil and steady moisture — roughly 4 cm (1.5 in) of water per week. Even watering is critical for storage cabbage: a dry spell followed by heavy uptake is the main cause of head-splitting, and a split head won’t store. A 5–8 cm (2–3 in) mulch layer buffers soil moisture and temperature and dramatically reduces splitting risk. Feed a balanced fertilizer at transplant, then side-dress with compost about four weeks in; ease off nitrogen once heads begin to firm, as excess nitrogen produces loose heads that don’t keep.

✂️ Harvesting & Storing

Harvest when heads feel rock-solid all the way through — Danish Ballhead should feel notably heavy for its size. Cut at the base with a sharp knife, leaving a few wrapper leaves to protect the head. For storage, harvest on a dry day, don’t wash the heads (surface moisture speeds decay), and trim the stem short. Wrap loosely or store in perforated bags in a cold, humid spot near 0°C (32°F): a root cellar, cold basement corner, or unheated-but-frost-free garage all work. Checked occasionally and stored well, whole heads hold four to six months.

🌱 Saving Seeds from Danish Ballhead

Danish Ballhead is an open-pollinated heirloom, so seed saved from it grows true to type. Cabbage is biennial — it flowers and sets seed in its second year — so overwinter a plant (in the ground in Zone 7+, or dug and stored in barely damp sand near freezing in colder zones) and replant in spring. It cross-pollinates by insects with any other flowering Brassica oleracea (broccoli, kale, cauliflower, kohlrabi, Brussels sprouts), so isolate by distance for pure seed. Our complete seed-saving guide walks through the biennial process.