Rutabaga

Growing Conditions

Growing Zones

Thrives in USDA Zones 2 - 8

Companion Planting

When to Plant

• Direct Sow

  Direct sow 90-110 days before first expected hard frost; typically midsummer (late June to mid-July in most zones)

• Harvest

  Harvest after several frosts have improved sweetness; roots 4-6 inches diameter are ideal. Can be left in the ground through hard freezes and mulched for in-ground storage in zones 5-7

Organic Growing Tips

• Use row covers from sowing through the first 4 weeks to prevent cabbage maggot fly from laying eggs at the root base; remove once roots begin to size up.

• Rotate with non-brassica crops at least every 3 years; clubroot persists in soil for 20+ years and is nearly impossible to eliminate once established.

• Apply lime if soil pH is below 6.0; clubroot is most severe in acidic conditions and pH correction provides significant suppression.

• Harvest before the ground freezes solid in cold zones; rutabaga left too long in frozen soil can develop pithy or watery texture in the core.

Common Pests

• Cabbage Maggot
• Flea Beetle
• Aphids
• Clubroot
• Powdery Mildew

Taxonomy

Kingdom

Plantae

Family

Mustard family (Brassicaceae)

Genus

Brassica

Species

Brassica napus var. napobrassica

Natural History

Rutabaga (Brassica napus var. napobrassica) is a relatively recent crop plant compared to most root vegetables, believed to have originated as a spontaneous hybrid between turnip (Brassica rapa) and wild cabbage (Brassica oleracea) somewhere in Scandinavia or northern Europe in the Middle Ages - the earliest written record appears to be from the Swiss botanist Gaspard Bauhin in 1620. The Swedish origin of the common name "swede" (used throughout Britain and Commonwealth countries) and the Swedish word "rotabagge" (which became "rutabaga" in North America) reflect the crop's Scandinavian associations. It spread through northern Europe and became particularly important in Scotland, Ireland, and Scandinavia as a reliable, storable, frost-tolerant crop for climates where other root vegetables performed poorly. In Scotland, "neeps" (rutabaga, also called swede) and "tatties" (potatoes) are the traditional accompaniment to haggis on Burns Night. The large size and sweetness of rutabaga compared to turnip made it a preferred livestock fodder across northern Europe, where it was grown in enormous quantities to feed cattle through winter. Its importance was dramatically illustrated during the First World War when, in the same "turnip winter" that devastated German civilians, rutabaga (Steckrube) was one of the few available foods and entered German cultural memory as a symbol of wartime hardship. In North America, rutabaga never achieved the popularity it has in Britain; it remains relatively obscure compared to turnip, though it is better suited to cold-climate autumn and winter cooking.

Traditional Use

Rutabaga was primarily a food crop in northern European agriculture with limited distinct medicinal traditions beyond the general Brassica family reputation for digestive health. As a brassica, it shares the family's documented content of glucosinolates and related compounds of interest in nutritional science.

• Northern European winter provisions tradition - Root

  In Scandinavian, Scottish, and Irish folk traditions, rutabaga was consumed as a substantial, calorie-providing winter food rather than as a therapeutic herb. Mashed rutabaga was standard winter fare and was associated with warmth, sustenance, and keeping healthy through cold months - an association more nutritional than medicinal. The glucosinolate compounds in all brassicas, which are responsible for their characteristic pungent flavor, have been associated in epidemiological studies with reduced cancer risk, but this connection was not part of traditional medicinal understanding.

Rutabaga is a safe, nutritious food. Like all brassicas, it contains goitrogens that can interfere with thyroid hormone production when consumed raw in very large quantities over extended periods; cooking largely deactivates these compounds. Individuals with thyroid conditions who eat large amounts of raw brassicas should discuss this with their healthcare provider.

This information is provided for historical and educational purposes only and is not medical advice. Always consult a qualified healthcare professional before making decisions related to your health.

Morphology (Plant Structure & Identification)

• Root System

  Swollen taproot - the harvested rutabaga - with a fibrous root system below. The root has a distinctive purple-green top (the part above soil level) and yellow-cream coloring below.

• Stem

  Short crown above the root with a leaf rosette; the neck of the plant (where leaves attach) is notably longer and rougher than in turnips. Smooth leaves rather than the hairy leaves of turnips.

• Leaves

  Blue-green, smooth, waxy leaves similar to cabbage foliage; distinctly different from turnip's rough, hairy leaves. The waxy, smooth surface is a good field identification character.

• Flowers

  Yellow four-petaled brassica flowers if plants bolt; rutabagas are biennial and flower in the second year from seed under normal conditions.

• Fruit

  Slender seed pods after flowering.

Known Varieties

Common cultivars worth knowing

• Laurentian

  The standard North American rutabaga; large purple-top roots with yellow flesh and excellent storage. The benchmark for flavor and production.

  Best for: General production; storage; the most available variety

• American Purple Top

  Similar to Laurentian but selected for uniform globe shape and improved disease resistance. Widely available.

  Best for: General growing; uniform roots

• Helenor

  European variety with mild, sweet flavor and very smooth, round roots; excellent table quality with less bitterness than older varieties.

  Best for: Fresh table use; superior flavor

• Marian

  Clubroot-resistant variety; the best choice where clubroot has been problematic. Flavor and texture are comparable to standard varieties.

  Best for: Clubroot-infected soils