Leonardo radicchio stands as a testament to modern breeding excellence, delivering the uniform heads and slow-bolting reliability that commercial growers and home gardeners desperately needed from this notoriously finicky crop. This F1 hybrid reaches harvest in just 65 days, producing consistent, tightly formed heads even when older radicchio varieties would have bolted or formed irregularly. With its ability to withstand temperatures as low as 20°F once properly hardened, Leonardo bridges the gap between radicchio's Mediterranean heritage and North American growing conditions.
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What sets Leonardo apart is its remarkable uniformity and predictability in a crop known for inconsistency. This F1 hybrid was specifically bred to overcome the challenges that plagued older radicchio varieties, delivering reliable performance across diverse growing conditions. Its slow-bolting nature means you get properly formed heads instead of premature flowering, while its hardy constitution allows for early spring planting as soon as soil can be worked. The variety thrives in cool weather conditions of 60-65°F, making it perfect for spring and fall harvests when other greens struggle.
Leonardo radicchio excels both raw and cooked, bringing its characteristic bitter bite to fresh salads where it adds color and complexity. When lightly steamed, the bitterness mellows into a more nuanced flavor that complements soups and warm preparations. Its firm texture holds up beautifully to grilling or braising, making it versatile for both traditional Italian preparations and modern culinary applications.
No timeline data available yet for this variety.
Sow seeds in flats at 4 seeds per inch or in 3/4 inch plug trays, barely covering with fine vermiculite. Start seeds 3-4 weeks before transplanting outdoors. Keep soil surface cool below 75°F by shading flats on sunny, warm days during germination. Transplant seedlings 1-2 inches apart into flats or cell containers about 2 weeks after germination.
Harden seedlings by reducing water and temperature for 2-3 days before planting outdoors. Properly hardened transplants can survive temperatures as low as 20°F. Transplant 8 inches apart in rows 18 inches apart, setting plants shallowly so the base sits slightly above soil level to prevent bottom rot.
Radicchio can be direct sown as early as soil can be worked in spring, taking advantage of its hardy nature and cool weather preference.
Harvest Leonardo radicchio at 65 days when heads are firm and well-formed. Cut frequently and while plants are young for the best flavor and texture. A rinse in cold water immediately after harvest helps preserve both flavor and crisp texture.
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