Sow in early spring 2-3 weeks before the last spring frost and again in midsummer for a fall harvest. . In a sunny location with average, well-worked soil sow seeds evenly and thinly in rows 12" apart. Cover with 1/4" of fine soil. Firm lightly and keep evenly moist. Seedlings emerge in 7-14 days depending on soil and weather conditions.
How to Grow Radicchio
Thin to stand 12" apart when seedlings are 3" high. For mid summer plantings, cut off all leaves above the crown in early fall. New growth in cool weather produces the small, red, cabbage-like heads. Keep well watered during dry spells. Since radicchio is shallow rooted be careful not to disturb the roots during weeding.
Harvest radicchio heads after a light frost by cutting them just below the soil surface.
Radicchio makes a great lettuce substitute in salads, and the leaves can also be saut¿ed or