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High Mowing Organic Seeds
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Organic Non-GMO Greens - Specialty::Organic Non-GMO Radicchio::Organic Leonardo F1 Radicchio

Organic Leonardo F1 Radicchio  Organic Non-GMO Leonardo F1 Radicchio - HYBRID

Large, perfectly round heads are intensely purple with bright white midribs. Extremely vigorous variety that strongly resists bolting and shows some resistance to tip burn. Heads average 1 lb each at maturity. Plant for fall and winter crops, when color and flavor is best. Chioggia-type · Round 4-5" heads (Chicorium intybus)

Days to maturity: 85 days
SKU Description Our price
1992A 100 Seeds $6.80
1992B 500 Seeds $26.25
1992M001 1 M $48.50
1992M005 5 M $209.50 $41.90/M
1992M025 25 M $922.50 $36.90/M Out of stock for 2016

Unit Size

Organic Radicchio: Growing and Seed Saving Info

Downloadable version of Radicchio Growing and Seed Saving Info

Radicchio is a cool season annual in the Asteraceae/Compositae family, which includes lettuce, endive, escarole, chicory, globe artichoke, sunflower, Jerusalem artichoke, salsify, and burdock. Radicchio has similar culture to lettuce, but produces very tight heads with blanched interiors and unique bitter flavor. Radicchio is a popular component of mesclun mix because of its unusual color and sophisticated flavor. There are several types:

  • Sugarloaf radicchios are narrow and upright with green outer leaves and crispy yellow-white interiors
  • Treviso-type radicchios have upright, elongated heads with burgundy interior leaves that have bright white ribs
  • Chioggia-type radicchios have round and slightly flattened, densely packed heads with bright magenta interiors

Soil Requirements

Radicchio does well in the same conditions as lettuce, preferring cool, well-drained, loose soil. As with lettuce, use 50-75lbs Nitrogen/acre, ~150lbs Phosphorus and Potassium/acre. Side-dress with N 3-4 weeks after planting. When transplanting, use 2lbs/50 gallons starter fertilizer, 4-8oz per plant.


Full sun to part shade.

Seeding Depth


Seeding Rate

Direct seed 3 seeds every 8.

Plant Spacing


Row Spacing


When to Sow

Radicchio does best in the cool weather of spring, fall, and early winter, and fall crops tend to have fewer problems and produce larger heads. Direct seeding is not recommended in early spring because of the risk of cold-induced bolting. Sow in a greenhouse in plug trays (2 seeds/plug, thinned to one) with tapered cells and a fine-textured starting mix. Cover seeds lightly with vermiculite. Ideal germination temp is 75F (day) and 68F (night). Feed with liquid fertilizer once seedlings have germinated. Seedlings should be ready to plant out in 3-4 weeks.

Other Considerations

The use of row cover is not recommended for radicchio except when threatened by heavy frost.

Frost Tolerant

Radicchio can withstand light frosts, just peel off damaged outer leaves. Leafier varieties are more frost-tolerant. Color and flavor benefit from extreme fluctuations between day and nighttime temperatures.

Drought Tolerant

Chicories are generally drought-tolerant but require even moisture for uninterrupted growth. Irrigation is recommended during dry periods.

Heat Tolerant

Radicchio may bolt in hot, dry weather. Provide adequate moisture. Choose varieties like Leonardo F1 and Virtus F1 for summer plantings.

Seed Specs

About 20,000 seeds/oz.

Seeding Rate

At a rate of 3 seeds every 8: 220/1M; 1,100/5M; 2,200/10M;

and 131M/acre.


Begin harvesting 6-10 weeks after planting out seedlings. Heads are firm when mature and will not continue to grow after this point (except to bolt). Heads hold better in the field in cool fall weather. Ideal size is about 5 in diameter for Chiogggias, 7-8 tall for Trevisos and 10 tall for Sugarloaf. Leaves pulling away or heads becoming pointy are early signs of bolting. Use a sharp harvest knife to cut plant at the base of the head, being careful not to cut the head itself. Heads should be harvested in cool weather or chilled immediately. Heads are usually trimmed for sale.


Heads will keep for 3-4 weeks if refrigerated in a perforated plastic bag or tote.

Disease Resistance

In moist, damp conditions bottom rot may occur, but radicchio is much less susceptible than lettuce.

Seed Saving

Radicchio will easily go to seed if allowed. The flowers are insect-pollinated and can cross pollinate with other radicchios, endives, or Wild Chicory, which is very commonly found. For pure seed, isolate by mile or cage plants. It can be difficult to separate seeds from flowers; crush the dried flowers to release the seeds. Seeds will be viable for 4-8 years starting with approximately 70% germination.

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