Radicchio

Asteraceae

Chicory family. Distinctive deep red/purple leaves with white veins. Slightly bitter flavor that mellows with cold and blanching. Forms tight cabbage-like heads. Grows best at 45-65°F. Thermal dormancy above 77°F. LONGEST DTM in this category (60-85 days). Best grown for fall harvest. 'Chioggia' (round head, 65 days) and 'Treviso' (elongated, 80+ days) are traditional varieties.

At a Glance

Days to Maturity

60–85 days

Sun

6+ hours

Spacing

8–12 "

Container

Yes

2+ gallon pot

Zone Planting Guide

Your USDA Zone:

Growing Guide

Germination

Germination Time 5–10 days

Optimal Temp 63°F

Watering

Weekly Water 1–1.5 "

Needs Moderate-consistent

Soil

pH Range 6–6.8

Resilience

Heat: Medium Cold: Medium Drought: Low

Nutrition

Feeding Intensity Moderate feeder

Harvest

Head feels firm when squeezed, like a small cabbage.

Storage 21 days — Stores well — chicory family is hardier than lettuce.

Sources

seed-catalog Johnny's Seeds — Radicchio university UMN Extension university UC Master Gardener Sonoma extension Growing lettuce, endive and radicchio in home gardens (University of Minnesota Extension) seed_catalog Radicchio – Key Growing Information (Johnny's Selected Seeds)

More Vegetables

Radicchio Planting Dates by Zone

Planting dates for Radicchio vary by USDA hardiness zone. Select your zone below for frost dates, start-indoors timing, and a full monthly planting calendar.

Zone 5A Zone 5B Zone 6A Zone 6B Zone 7A Zone 7B Zone 8A Zone 8B Zone 9A Zone 9B

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