How to Grow Radicchio Rosso Treviso

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Radicchio Rosso Treviso

Cichorium intybus var. foliosum

vegetable

Radicchio Rosso Treviso is an Italian heirloom chicory variety prized for its elongated, burgundy-red leaves with prominent white ribs and a distinctive bitter-sweet flavor. It forms loose, tapered heads rather than compact rounds, making it visually striking and excellent for both raw and cooked preparations. This cool-season crop develops its characteristic deep color and refined flavor best when exposed to frost.

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Example Radicchio Rosso Treviso timeline · Pittsburgh, PA (Zone 6b)

Plant Radicchio Rosso Treviso
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Radicchio Rosso Treviso
Around Jun 16

≈ 60 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Radicchio Rosso Treviso dates for your own zip code.

Growing Conditions

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Sun: Full sun, 6-8 hours daily; afternoon shade acceptable in hot climates

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Water: Consistent moisture (1-1.5 inches per week); keep soil evenly moist but not waterlogged. Water at the base to minimize leaf diseases

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Spacing: 8-12 inches apart in rows 12-18 inches apart inches

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Days to maturity: 60-90 days (longer for autumn/winter crops when flavor develops best)

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Planting depth: 0.25-0.5 inches for seeds; transplants at soil line

Soil

Type: Well-draining, fertile loamy soil rich in organic matter

pH: 6.0-7.5

Amendments:

Compost aged manure peat moss or coconut coir

Growing Zones

Find your zone →

Zones 5-8 are ideal; can be grown in zones 4-9 with proper timing

4a 4b 5a 5b 6a 6b 7a 7b 8a

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Growth Stages

Seedling

2-3 weeks

Tiny heart-shaped cotyledons emerge; first true leaves appear oval and green

Keep soil consistently moist; protect from slugs and cutworms. Thin seedlings when 2-3 inches tall to proper spacing. Provide bright light indoors if starting seeds

Vegetative Growth

4-6 weeks

Plant develops multiple elongated, green leaves with prominent white center ribs. Forms an open rosette structure

Water deeply and regularly. Apply balanced fertilizer every 2-3 weeks or use compost side-dressing. Mulch to retain moisture and suppress weeds. Monitor for pests and disease

Head Formation

2-3 weeks

Outer leaves begin darkening to burgundy-red; inner leaves tighten slightly. Plant reaches 10-12 inches tall. White ribs become more prominent

Continue consistent watering. Cool temperatures (50-65°F) enhance color development. Reduce nitrogen fertilizer to concentrate flavors. Begin foliar sprays of potassium sulfate if desired to deepen color

Frost Enhancement

2-4 weeks (autumn/winter only)

With exposure to light frosts (28-32°F), leaves deepen to vibrant burgundy-red; bitterness mellows and sweetness increases. Head becomes more compact

Do not harvest before first frosts if possible—wait for cold nights to develop optimal flavor and color. Protect from hard freezes below 20°F that may damage the plant. Harvest individual outer leaves or entire heads as needed

Harvest Ready

Ready to harvest

Plant displays deep burgundy-red coloring with bright white ribs throughout; leaves are crisp and tender with balanced bitter-sweet flavor

Harvest in morning when turgor is highest for crispest texture. Cut entire head at soil line or remove outer leaves individually for extended harvest. Store in cool, humid conditions (32-40°F) for 2-3 weeks

Companion Planting

Plan your garden →

Plant with:

Beets Carrots Celery Chard Endive Garlic Lettuce Onions Spinach Thyme

Avoid planting near:

Fennel Pole beans Tomatoes Kohlrabi

Common Pests

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Hand-pick in early morning; use beer traps; apply diatomaceous earth around plants; encourage ground beetles with shelter
Spray with strong water spray; use insecticidal soap; introduce ladybugs; apply neem oil in early morning or evening
Use floating row covers on young plants; yellow sticky traps; apply spinosad if damage is severe; encourage beneficial insects
Use cardboard collars around seedlings; hand-pick at night; encourage ground predators; apply diatomaceous earth
Ensure good air circulation; water at soil level only; remove affected leaves; apply sulfur dust or baking soda spray (1 tbsp per gallon water)
Plant resistant varieties when possible; improve drainage; space plants widely; apply copper fungicide if needed; remove infected leaves

Uses

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Salads and raw preparations

Culinary

The striking burgundy leaves with white ribs make Radicchio Rosso Treviso a showstopping salad ingredient. Its bitter-sweet flavor adds complexity to mixed greens, and it pairs beautifully with vinaigrettes, citrus dressings, and creamy sauces. [source]

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Grilled and cooked dishes

Culinary

When grilled or roasted, the bitterness mellows and the leaves caramelize, developing a rich, slightly sweet flavor. It's excellent in pasta, risotto, soups, and can be braised or sautéed with garlic and olive oil. [source]

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Digestive and liver support

Medicinal

Radicchio contains inulin and other compounds traditionally used to support digestive health and liver function. The bitter compounds stimulate digestive secretions and may aid nutrient absorption. [source]

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Natural dye source

Household

The deep burgundy leaves can be used to create natural dyes for textiles and craft projects, producing shades of red and purple depending on mordants used. [source]

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Reduced-bitterness preparation for sensitive palates

Culinary

Blanching or soaking radicchio leaves in water for 15-30 minutes reduces bitterness significantly, making it more palatable for those sensitive to bitter flavors while retaining nutritional value. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Radicchio Rosso Treviso is best harvested after exposure to light frosts, which enhance flavor and color. In fall/winter crops, harvest after first frost when leaves have turned deep burgundy. Cut the entire head 1-2 inches above soil level using a sharp knife, or remove outer leaves individually for continuous harvest. For spring plantings (where frost development is minimal), harvest when heads reach 6-8 inches long. Harvest in early morning for maximum crispness. Store in cool (32-40°F), humid conditions; will keep 2-3 weeks loosely wrapped in plastic

Fun Facts

🌱 Radicchio Rosso Treviso is protected by PDO (Protected Designation of Origin) status in the EU when grown in the Treviso region of Italy, making it a true heirloom cultivar with centuries of agricultural tradition
🌱 The plant's burgundy pigmentation is caused by anthocyanins, the same compounds that make blueberries and red wine beneficial, and their production is triggered by exposure to cold temperatures—a mechanism called 'cryoprotection'
🌱 Despite its Italian heritage, radicchio was likely domesticated from wild chicory in the Mediterranean region and is closely related to endive, escarole, and witloof chicory, all variants of Cichorium intybus

Gardening Terms

New to gardening? Learn about terms used in this guide:

Compost Full Sun Heirloom Mulch True Leaves

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