The plant looks like a clump of fennel topped with asparagus stems. This type needs to be blanched for the best flavor. Radicchio grows in zones 4-10. Sow radicchio seeds directly into your garden starting in the early spring 2-3 weeks before the final frost of the season.
How long does it take for radicchio to germinate?
Sow in average, well-worked soil in a sunny location. In rows 12 inches apart, sow seeds evenly and cover with ¼ inch of fine soil. Firm lightly and water gently. Seedlings emerge in 7-14 days depending on soil and weather conditions.
How long does it take for radicchio to mature?
Shortly after planting, start feeding radicchio with a water-soluble plant food. Harvest leaves when they are large enough to eat. Heads are ready to be picked once they are firm (approximately 60 days after planting).
When should I start radicchio seeds?
Direct seed radicchio in the spring as soon as the soil can be worked or start seed indoors 8 weeks before the last frost in spring protected by a plastic tunnel. Seeds germinate quickly even in cold soil and light frost will not harm the seedlings. Avoid growing radicchio during the summer.
Should I start radicchio indoors?
Either direct seed or start indoors and transplant. Sow seeds 5mm (¼”) deep, and thin or transplant to allow 30-45cm (12-18″) between plants in rows 30-45cm (12-18″) apart. From direct sowing. Ideal pH: 6.0-6.5.
How do you harvest radicchio seeds?
You can harvest as early as two weeks after the flowers open. You can pull the whole plant, roots and all and allow it to dry upside down in a well-ventilated area protected from the elements for further seed development. You can also cut the seed stalks off as they mature and place them in a paper bag for drying.