How to Grow Treviso Tardivo
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Treviso Tardivo
Cichorium intybus var. foliosum
vegetableTreviso Tardivo is a late-harvest Italian chicory prized for its elongated, deep red leaves with white ribs and slightly bitter, complex flavor. This heirloom radicchio variety requires a traditional forcing process after harvest to develop its characteristic color and tender texture. It is considered one of the most flavorful and visually striking chicory varieties.
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Example Treviso Tardivo timeline · Pittsburgh, PA (Zone 6b)
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Plant Treviso Tardivo
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 Treviso Tardivo
Around Jul 16≈ 90 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Treviso Tardivo dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-8; cold temperatures enhance flavor development
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Seedling
2-3 weeksTiny cotyledons emerge 7-10 days after sowing. First true leaves appear narrow and light green.
Keep soil consistently moist but not waterlogged. Thin seedlings to 1-2 inches apart when they develop first true leaves. Provide bright indirect light if indoors.
Vegetative Growth
4-6 weeksPlant develops multiple upright leaves forming a loose rosette. Green outer leaves expand; inner leaves remain pale. Root system deepens.
Maintain consistent moisture and apply balanced fertilizer every 3-4 weeks. Thin to final spacing of 12 inches. Remove any flower buds that form prematurely. Weed regularly.
Head Development
3-4 weeksLeaves tighten into a compact, oblong head. Leaves remain predominantly green with white ribs. Head becomes denser and more elongated.
Reduce watering slightly to encourage head formation. Continue light fertilization. Protect from heavy rain which can cause rot. Monitor for pest damage.
Mature Head Formation
2-3 weeksTight, firm elongated head develops. Leaves are deep green with prominent white veins. Heads reach 6-8 inches long.
Stop fertilizing. Water only if conditions are very dry. Harvest just after first frost or when temperatures drop below 50°F regularly. This is when forcing should begin.
Forcing (Post-Harvest)
3-4 weeksRoots are trimmed and replanted in sand or soil in darkness at 50-55°F. New leaves emerge white and tender, gradually turning deep red and magenta with white ribs.
Maintain darkness and cool, humid conditions (around 90% humidity). Ensure good air circulation to prevent fungal issues. Harvest when new leaves are 4-6 inches long and fully colored, typically 3-4 weeks after forcing begins.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Use row covers on young plants; spray with neem oil or spinosad if damage appears; encourage beneficial insects
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Spray with strong water jet; use insecticidal soap; introduce ladybugs or parasitic wasps
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and
Hand-pick in early morning; use copper barriers; apply diatomaceous earth; encourage ground beetles
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Remove affected leaves; use yellow sticky traps; spray with spinosad
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Hand-pick; use Bt (Bacillus thuringiensis); encourage natural predators like birds
Uses
Salads and Raw Preparations
CulinaryTreviso Tardivo's slightly bitter, complex flavor makes it excellent in mixed leaf salads, especially when dressed with balsamic vinegar and olive oil. The tender, forced leaves are less bitter than the raw head and provide visual appeal with deep red coloring. [source]
Grilled and Roasted Dishes
CulinaryThe firm head structure holds up well to grilling, roasting, or braising. When cooked, the bitterness mellows and the leaves become tender and slightly sweet, making it a sophisticated side dish. [source]
Digestive and Liver Support
MedicinalChicory contains inulin and has been traditionally used to support digestive health and liver function. The bitter compounds stimulate digestive secretions and may support bile production. [source]
Natural Coffee Substitute
HouseholdDried and roasted chicory root has been historically used as a coffee substitute or additive, particularly in European cuisine. It provides a bitter, earthy flavor without caffeine. [source]
Natural Dye Production
CraftThe deep red pigments in Treviso Tardivo leaves can be used to create natural dyes for textiles and art projects, producing reddish-purple hues. [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 mature heads in late fall after the first frost, which sweetens the flavor and begins the natural conditioning process. Cut heads at the base with a sharp knife, leaving roots intact. For traditional Treviso Tardivo, perform the forcing process: trim roots to 1 inch, remove outer damaged leaves, and plant roots 2-3 inches deep in moist sand or soil in a cool (50-55°F), dark space with high humidity. New leaves will emerge white and gradually turn deep red over 3-4 weeks. Harvest when new leaves are fully colored and tender, typically 3-4 weeks after forcing begins.
Fun Facts
- 🌱 Treviso Tardivo is a Protected Designation of Origin (PDO) product in Italy, meaning only chicory grown and forced in the Treviso region can legally bear the name
- 🌱 The forcing process was historically discovered by accident when roots left in cool cellars over winter produced tender, colorful shoots—now it's an essential part of the traditional preparation
- 🌱 Unlike other radicchio varieties, Treviso Tardivo requires cold temperatures and a specific harvest timing to trigger the flavor compounds that make it prized by Italian chefs
Gardening Terms
New to gardening? Learn about terms used in this guide:
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