How to Grow Treviso Naturale
Wikimedia Commons
Treviso Naturale
Cichorium intybus var. foliosum
vegetableTreviso Naturale is an Italian heirloom radicchio with deep red leaves and white ribs, prized for its slightly bitter, complex flavor. This open-pollinated variety forms loose, elongated heads and is less compact than modern radicchio cultivars. It's a cool-season crop that develops its characteristic deep coloring after exposure to frost.
When should you plant Treviso Naturale 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 Treviso Naturale timeline · Pittsburgh, PA (Zone 6b)
-
Plant Treviso Naturale
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Treviso Naturale
Around Jun 26≈ 70 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Treviso Naturale dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-8; best grown as a fall/winter crop
Sign up free to see if Treviso Naturale grows in your zone — and get a personalized planting timeline.
Get my Treviso Naturale timeline →Growth Stages
Seedling
2-3 weeksFirst true leaves emerge; plant is 2-4 inches tall with delicate green foliage
Keep soil consistently moist but not soggy. Provide bright light and protect from damping-off with good air circulation. Thin seedlings to proper spacing.
Vegetative/Rosette Formation
4-6 weeksPlant develops multiple leaves in an open rosette pattern; foliage begins to show hints of red
Water deeply and consistently. Begin light fertilizing every 2 weeks with balanced fertilizer. Remove any damaged leaves. Ensure adequate spacing to prevent fungal issues.
Head Development
3-4 weeksLeaves become more upright and compact; distinctive red and white coloring intensifies; elongated head structure forms
Maintain consistent moisture. Continue regular fertilization. As heads tighten, remove any yellowed or damaged outer leaves. This stage is critical for head quality.
Color Development & Frost Hardening
2-3 weeksDeep red coloring fully develops; plants become sweeter and less bitter after exposure to light frost
Light frost (28-32°F) enhances flavor and color. Reduce watering slightly as plants mature. Stop fertilizing. Handle plants gently to avoid bruising.
Harvest Ready
Ongoing, staggered harvestHeads are firm, fully colored with deep burgundy and white ribs, and reach 6-10 inches in length
Harvest before heavy freezes or when heads feel firm to gentle pressure. Cut at the base with a sharp knife. Store in cool conditions (32-40°F) for extended shelf life.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Spray with neem oil or insecticidal soap; encourage beneficial insects like ladybugs; strong water spray to dislodge
-
Use row covers on young plants; diatomaceous earth; neem oil; companion planting with trap crops
-
and
(Gastropoda)
Hand-pick in early morning; beer traps; copper barriers; encourage ground beetles and toads
-
Row covers; Bt (Bacillus thuringiensis); hand-pick eggs and larvae; companion planting with herbs
-
Row covers; crop rotation; granular diatomaceous earth at soil level; remove plant debris promptly
-
Improve air circulation; sulfur spray; neem oil; avoid overhead watering; remove infected leaves
Uses
Salads and Raw Preparations
CulinaryTreviso Naturale's slightly bitter, complex flavor with subtle sweetness makes it ideal for elegant salads, especially after frost. Shred or quarter heads for use in mixed greens or as a standalone salad with vinaigrette. [source]
Grilled and Roasted
CulinaryCut heads lengthwise and grill or roast with olive oil to caramelize the leaves, reducing bitterness and bringing out natural sweetness. Popular in Italian cuisine for warm salads and side dishes. [source]
Digestive Health and Antioxidants
MedicinalRadicchio contains inulin, a prebiotic fiber supporting digestive health, and polyphenols with antioxidant properties. The bitter compounds stimulate gastric secretions and may aid digestion. [source]
Natural Dye
HouseholdThe deep red and purple pigments (anthocyanins) from radicchio leaves can be used as a natural dye for textiles and paper crafts, yielding beautiful burgundy to pink tones. [source]
Risotto and Pasta
CulinaryFinely chopped Treviso Naturale can be incorporated into risotto for color, flavor, and nutrition, or used in pasta dishes. Its color produces striking deep-purple or burgundy-tinted dishes. [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 in fall or early winter after light frost (optimal flavor timing). Cut heads at the base with a sharp knife when they feel firm and are fully colored. Morning harvest when plants are crisp is ideal. Treviso Naturale can be cut individually as heads mature, or the entire plant can be harvested. Store at 32-40°F in high humidity for 3-4 weeks. For extended storage, wrap in paper and refrigerate.
Fun Facts
- 🌱 Treviso Naturale is named after the Veneto region of northern Italy, where radicchio has been cultivated for centuries and is a cornerstone of Italian cuisine.
- 🌱 The bitter compounds in radicchio (intybin and lactucopicrin) intensify as temperatures drop, which is why frost-exposed heads are prized by chefs for superior flavor complexity.
- 🌱 This open-pollinated heirloom variety is less uniform than modern hybrid radicchios, which appeals to growers valuing seed-saving and genetic diversity; plants can be allowed to bolt in spring to produce flowers for seed collection.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Treviso Naturale planting timeline
Tell us your zip code and we'll calculate exactly when to start Treviso Naturale 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 Treviso Naturale timeline →