Radicchio Seeds - Castelfranco

Castelfranco radicchio seeds produce cool-season leafy plants known for their open, loose head formation. Plants develop upright outer leaves and a broad rosette growth habit and are commonly grown as annuals or biennials depending on climate. This type performs best in cool to mild temperatures and is well suited for spring and fall planting. Castelfranco radicchio adapts well to garden beds, raised beds, and containers when grown in well-drained soil with consistent moisture, making it suitable for home and small-scale planting.

Features

• Cool-season leafy growth habit

• Loose head and rosette-style plant structure

• Suitable for garden beds, raised beds, and containers

• Performs best in cool and temperate climates

• Adaptable to well-drained soils with regular moisture

Specifications

• Scientific Name: Cichorium intybus

• Common Name (US): Radicchio

• Seed Type / Variety: Castelfranco

• Growth Habit: Upright leafy annual or biennial

• USDA Hardiness Zones: 3 to 9

• Planting Season: Spring and fall

• Sowing Season:

  • Indoors: February to March, August

  • Outdoors: March to May, August to September

• Germination Time And Conditions: 7 to 14 days; soil temperature 55 to 70 F

• Sunlight Requirements: Full sun to partial sun

• Soil Requirements: Well-drained, fertile soil with organic matter

• Watering Needs: Regular watering; consistent moisture

• Mature Plant Size: 10 to 14 inches tall, 8 to 12 inches spread

• Plant Spacing: 10 to 12 inches apart