How to Grow Trevisano Radicchio
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Trevisano Radicchio
Cichorium intybus var. foliosum
vegetableTrevisano is an Italian heirloom radicchio variety featuring elongated, deep burgundy heads with white veining and a slightly bitter, complex flavor. This cool-season crop forms tightly bundled leaves that become sweeter after frost exposure. It's prized by chefs for roasting, grilling, and adding visual drama to salads.
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Example Trevisano Radicchio timeline · Pittsburgh, PA (Zone 6b)
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Plant Trevisano Radicchio
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 Trevisano Radicchio
Around Jul 16≈ 90 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Trevisano Radicchio dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-9; best quality in cooler climates (zones 5-7)
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Seedling
2-3 weeksTiny cotyledons emerge; true leaves unfold within 1-2 weeks. Plants develop first 2-4 true leaves.
Keep soil moist but not waterlogged. Thin seedlings to 2-3 inches apart once they have true leaves. Provide bright light if indoors.
Vegetative Growth
6-8 weeksLoose rosette of green leaves forms; plant expands outward. Leaf edges remain open and spread.
Space plants to final 12 inches apart. Maintain consistent moisture and apply light nitrogen fertilizer every 3 weeks. Mulch to retain moisture and cool soil.
Head Formation
3-4 weeksLeaves begin tightening and bundling inward. Color gradually deepens from green to burgundy from outer leaves inward.
Reduce nitrogen and increase potassium to promote head tightness and flavor concentration. Continue consistent watering. Remove any damaged outer leaves.
Maturity
2-4 weeksTightly bundled, elongated heads form with deep burgundy coloring and prominent white ribs. Heads feel firm when gently squeezed.
Frost exposure sweetens and improves flavor—harvest after light frosts if possible. Stop fertilizing. Maintain even moisture to prevent bolting.
Harvest
Ongoing as heads matureHeads are compact, firm, and fully colored. Ready for cutting when 4-6 inches long.
Cut at soil level with a sharp knife. Handle gently to avoid bruising. Store in cool conditions for extended shelf life.
Common Pests
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Row covers over young plants; neem oil or insecticidal soap; diatomaceous earth on leaves
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Strong water spray; insecticidal soap; neem oil; introduce ladybugs
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Hand-pick at dusk; beer traps; copper barriers; diatomaceous earth; encourage ground beetles
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Remove infected leaves; reflective mulch; spinosad spray if severe
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Handpick; Bacillus thuringiensis (Bt); neem oil; encourage parasitic wasps
Uses
Roasting and Grilling
CulinaryTrevisano's firm structure and slight bitterness make it ideal for roasting whole or halved, and grilling. The heat caramelizes natural sugars and mellows the bitter compounds, creating a tender, complex vegetable side dish. [source]
Fresh Salads
CulinaryThe burgundy color, white veining, and crisp texture add visual appeal and sophisticated flavor to mixed green salads. Use raw in winter salads where its bitterness complements creamy dressings and vinaigrettes. [source]
Digestive Support
MedicinalRadicchio contains inulin and other compounds that support digestive health and gut bacteria. Traditionally used in Italian cuisine and herbalism to promote healthy digestion and liver function. [source]
Natural Food Coloring
HouseholdThe deep burgundy pigments (anthocyanins) can be used as a natural food dye or to add vibrant color to dishes, smoothies, and pickled preparations. [source]
Pickling and Preservation
CulinaryTrevisano's firm structure makes it excellent for pickling whole or in wedges. The bitterness is balanced by vinegar and spices, creating a flavorful condiment for winter storage. [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 when heads are firm and fully colored, typically 90-120 days from seeding. Cut at soil level with a sharp knife in the early morning. Flavor improves after frost; delay harvest until after light freezes if possible. Outer leaves may be removed if damaged, but don't peel away protective leaves excessively. Store at 32-36°F in high humidity for 3-4 weeks.
Fun Facts
- 🌱 Trevisano is named after Treviso, a region in northeastern Italy where this radicchio variety has been cultivated since the 1800s and remains a protected regional specialty.
- 🌱 The bitter flavor of radicchio comes from compounds called sesquiterpene lactones, which actually become sweeter and less intense after the plant experiences frost or freezing temperatures.
- 🌱 In Italian cuisine, radicchio is so valued that 'radicchio rosso di Treviso' has Protected Designation of Origin (PDO) status in the EU, ensuring quality and authentic production methods.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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