garden
Radicchio
Cichorium intybus var. foliosum
Edible
Edible Partsleaves
Overview
A striking, ruby-red Italian chicory with a bold, pleasantly bitter flavor that mellows beautifully when grilled or roasted. Radicchio is a cornerstone of Northern Italian cuisine, especially in the Veneto region where different cities have their own named varieties. Its bitter compounds stimulate digestion, and its dramatic color makes it a visual standout in salads and on the plate.
Growing Conditions
LightFull Sun
MoistureModerate
Hardiness Zones4 — 9
Height0.3m
Spread0.3m
Growth HabitForb/herb
LifespanAnnual
Pollinator Valuehigh
Companion Planting & Soil
Good Companions
Soil pH6 — 7
Soil TypeRich, well-drained, moist soil
Planting Calendar
When to sow, transplant, and harvest by growing zone.
| Zone | Action | Months | Notes |
|---|---|---|---|
| Cold (1-2) | Start Indoors | Mar — Apr | Start indoors 4-6 weeks before last frost; or direct sow after frost |
| Cold (1-2) | Direct Sow | Jun — Jul | Direct sow midsummer for fall harvest; heads form as days shorten |
| Cold (1-2) | Harvest | Aug — Oct | Cut heads when firm; frost sweetens and reduces bitterness |
| Cool (3-4) | Direct Sow | Apr — May | Direct sow in spring; thin to 10" apart |
| Cool (3-4) | Direct Sow | Jul — Aug | Summer sow for fall harvest; heads form with cool nights |
| Cool (3-4) | Harvest | May — Jun | Harvest spring heads; or wait for superior fall crop |
| Cool (3-4) | Harvest | Sep — Nov | Fall harvest after cool nights intensify color |
| Moderate (5-7) | Direct Sow | Mar — Apr | Spring sow; choose forcing types for tighter heads |
| Moderate (5-7) | Direct Sow | Jul — Aug | Fall crop; best flavor comes with cool autumn nights |
| Moderate (5-7) | Harvest | Apr — May | Spring harvest |
| Moderate (5-7) | Harvest | Sep — Nov | Fall harvest — superior flavor |
| Warm (8-9) | Direct Sow | Sep — Oct | Fall sow for winter harvest; heat causes bitterness |
| Warm (8-9) | Harvest | Nov — Feb (wraps) | Harvest through winter |
| Hot (10+) | Direct Sow | Oct — Nov | Cool-season crop only |
| Hot (10+) | Harvest | Dec — Feb (wraps) | Winter harvest only |
Uses
Culinary
- Grilled or roasted to mellow bitterness and caramelize
- Raw in salads for color and bitter counterpoint
- Risotto al radicchio — a Veneto classic
Medicinal
- Bitter compounds stimulate digestion and bile flow
- Rich in anthocyanins with anti-inflammatory properties
- Inulin prebiotic fiber feeds beneficial gut bacteria
Other Uses
- Dramatic visual element in vegetable gardens and on the plate
