How to Grow Tardivo di Treviso
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Tardivo di Treviso
Cichorium intybus var. foliosum
vegetableTardivo di Treviso is a late-season Italian radicchio variety prized for its deep burgundy leaves with white veining and naturally sweet, slightly bitter flavor. This heirloom cultivar develops its characteristic color and tender texture through a cold-hardening process after the first frost. It's a gourmet vegetable that requires patience and cool-season growing conditions to reach its full potential.
When should you plant Tardivo di Treviso in your zone?
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Example Tardivo di Treviso timeline · Pittsburgh, PA (Zone 6b)
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Plant Tardivo di Treviso
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Tardivo di Treviso
Around Jul 16≈ 90 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-9; requires cool fall and mild winter temperatures for optimal development
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Get my Tardivo di Treviso timeline →Growth Stages
Seedling
4-5 weeksEmerging seedlings with 2-4 true leaves; very tender and delicate
Keep soil consistently moist; provide 12-14 hours of light daily if starting indoors; transplant when 3-4 true leaves appear (4-5 weeks from seed). Harden off before moving to field.
Vegetative Growth
6-8 weeksPlant develops outer leaves and forms a loose rosette; green foliage predominates
Water deeply and regularly; apply balanced fertilizer every 3 weeks. Keep soil rich in nitrogen. Watch for pests. Provide consistent moisture—stress from drought can cause early bolting.
Head Formation
4-6 weeksLeaves begin to blanch and tighten into a loose head; some color change begins in cool weather
Reduce nitrogen; increase potassium and phosphorus to encourage head tightening. First frost (28-32°F) triggers color development and sweetness. Do not harvest until after frost.
Cold Hardening & Color Development
2-4 weeks minimum after first frostAfter frost exposure, leaves rapidly turn deep burgundy-red with prominent white ribs; heads become tender and sweet
Allow plant to experience multiple frosts (down to 20-25°F). This cold exposure concentrates sugars and develops the signature color and tender texture. This stage is critical for proper Tardivo quality.
Harvest Ready
Variable; extends through winter in mild zonesMature heads are compact with deep wine-red coloring, prominent white veining, and tender leaves
Harvest when soil is not frozen. Cut head at soil level with sharp knife. Heads can remain in ground in mild climates for extended storage and use through winter.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Row covers over seedlings; neem oil spray; encourage natural predators; select resistant varieties
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and
Handpick; beer traps; copper barriers; encourage ground beetles; diatomaceous earth around plants
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Floating row covers; Bt spray (Bacillus thuringiensis); hand-picking eggs; companion planting with aromatic herbs
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Strong water spray; insecticidal soap; neem oil; release of ladybugs; reflective mulch
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Row covers; crop rotation; avoid overwatering; diatomaceous earth; soil drench with beneficial nematodes
Uses
Gourmet Salad Base
CulinaryTardivo's tender leaves and natural sweetness make it a premium choice for composed salads. The striking deep red color and white veining provide visual drama. Pair with light vinaigrettes to showcase the subtle bitter-sweet flavor. [source]
Grilled or Roasted Vegetable
CulinaryQuarter heads and grill with olive oil until caramelized, or roast until edges crisp. The natural sugars caramelize beautifully in high heat. Serve with balsamic reduction and Parmesan cheese. [source]
Digestive & Liver Support
MedicinalChicory family vegetables contain inulin and other compounds traditionally used to support digestive health and bile production. The bitter compounds stimulate gastric secretions and may improve digestive function. [source]
Natural Dye Source
HouseholdThe deep burgundy color can be extracted and used as a plant-based dye for textiles. The pigments responsible are anthocyanins, the same compounds that make it nutritious. [source]
Ornamental Kitchen Garden
CraftWith its striking deep red color and elegant white veining, Tardivo di Treviso serves as a beautiful ornamental element in vegetable gardens. It's visually compelling enough to deserve garden space purely for aesthetic reasons. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Tardivo di Treviso must experience frost (ideally multiple light frosts between 20-32°F) before reaching prime eating quality. Harvest anytime after the first frost, typically November through February in most regions. Cut heads at the base with a sharp knife, leaving roots in ground—they may produce secondary shoots. Heads store well in cool conditions (35-45°F) for 4-8 weeks. For best flavor, harvest after a light frost when sugars are most concentrated.
Fun Facts
- 🌱 Tardivo di Treviso is protected by the EU Protected Geographical Indication (PGI) designation when grown in the Treviso region of Italy, meaning authentic versions must follow specific cultivation protocols.
- 🌱 The transformation of green leaves to deep burgundy after frost is caused by anthocyanin pigments produced in response to cold stress—the plant is essentially protecting itself from freezing damage while creating one of the most beautiful vegetables.
- 🌱 Unlike many radicchio varieties, Tardivo is grown specifically for fall/winter harvest; planting it too early or without adequate cool season temperatures results in bitter, poorly-colored heads that lack the characteristic sweetness.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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