How to Grow Rutabaga 'Joan'
Wikimedia Commons
Rutabaga 'Joan'
Brassica napus subsp. napobrassica
vegetableRutabaga 'Joan' is a cold-hardy root vegetable with a golden-yellow flesh and smooth, purple-topped skin. This Swedish turnip is prized for its sweet flavor and dense texture, making it excellent for storage and winter cooking. It's a cool-season crop that develops its best flavor after exposure to frost.
When should you plant Rutabaga 'Joan' in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Rutabaga 'Joan' timeline · Pittsburgh, PA (Zone 6b)
-
Plant Rutabaga 'Joan'
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Rutabaga 'Joan'
Around Jul 11≈ 85 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Rutabaga 'Joan' dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-8; prefers cooler climates and develops superior flavor in northern regions
Sign up free to see if Rutabaga 'Joan' grows in your zone — and get a personalized planting timeline.
Get my Rutabaga 'Joan' timeline →Growth Stages
Seedling
2-3 weeksSmall cotyledons emerge within 7-10 days; develop first true leaves with characteristic serrated edges
Keep soil consistently moist; thin seedlings to proper spacing once they have 2-3 true leaves. Protect from slugs and flea beetles with row covers if needed.
Leaf Development
3-4 weeksPlant produces 4-8 true leaves; a small root begins to swell underground; plant reaches 3-4 inches tall
Maintain consistent watering and monitor for cabbage worms and flea beetles. Begin light fertilization with balanced fertilizer every 3-4 weeks.
Maturation
3-4 weeksRoots reach 4-6 inches diameter with smooth skin; purple coloring intensifies on shoulders; foliage begins to yellow naturally
Reduce nitrogen fertilization to encourage root sweetness rather than excessive leaf growth. Continue regular watering for even development and sweetness after first frost.
Harvest-Ready
Ongoing from day 85 onwardRoots are firm, appropriately sized (4-6 inches), with smooth unblemished skin; flavor sweetens significantly after light frost
Can be harvested anytime after reaching usable size, but flavor improves with frost exposure. Leave in ground until needed or harvest before hard freeze for storage.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Use row covers on young plants; hand-pick larvae; apply Bacillus thuringiensis (Bt) spray; encourage parasitic wasps
-
Deploy row covers until plants are established; diatomaceous earth applications; insecticidal soap; remove crop residues
-
Use row covers during egg-laying periods (spring and early summer); crop rotation; avoid planting near brassica residues
-
Strong water spray to dislodge; insecticidal soap; encourage natural predators like ladybugs and lacewings
-
Practice crop rotation (3+ years); maintain soil pH above 6.5; remove infected plants; avoid contaminating tools and soil
Uses
Winter cooking & roasting
CulinaryRutabaga 'Joan' is excellent roasted, mashed, or added to stews and braises. Its sweet, dense flesh becomes tender and develops richer flavor when cooked, especially after frost exposure. [source]
Nutritious side dishes
CulinaryHigh in vitamin C, potassium, and fiber; can be prepared similarly to turnips, potatoes, or squash. Often used in Scandinavian and Eastern European cuisine. [source]
Long-term storage
HouseholdExcellent storage crop for winter food security; stores longer than most root vegetables when kept cool and humid. Ideal for root cellars and cool basements. [source]
Traditional digestive aid
MedicinalBrassica vegetables like rutabagas contain glucosinolates, compounds studied for potential anti-inflammatory and digestive benefits in traditional cuisine. [source]
Cold-season wildlife food
WildlifeLeft unharvested, mature rutabagas can provide emergency forage for deer and other wildlife during harsh winter months. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Harvest Rutabaga 'Joan' when roots reach 4-6 inches in diameter (approximately 85-110 days from planting). For best flavor, harvest after the first light frost, which converts starches to sugars. Gently loosen soil with a garden fork and pull plants; trim leaves to 1 inch. Roots can be left in ground in cool climates until needed; in warmer zones, harvest before soil freezes hard. Store in a cool (32-40°F), humid location with high moisture; properly stored roots keep 2-4 months.
Fun Facts
- 🌱 'Joan' is a modern variety bred for improved storage capacity and resistance to root diseases, making it more reliable than heirloom strains for home gardeners.
- 🌱 Rutabagas are sometimes called 'Neeps' in Scotland and 'Turnips' in parts of North America, though botanically distinct from true turnips (Brassica rapa).
- 🌱 The flavor of rutabaga actually improves after frost exposure because cold temperatures trigger the conversion of starches into natural sugars—a process called cryoprotection.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Rutabaga 'Joan' planting timeline
Tell us your zip code and we'll calculate exactly when to start Rutabaga 'Joan' seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Rutabaga 'Joan' timeline →