Crops & Breeds › Vegetable Garden
🥗 Radicchio
Vegetable Garden · growing reference
| Days to maturity | 65 days – 85 days, by type |
|---|---|
| Germination | 5 days |
| Direct sowing | +7 days vs transplants |
| Spacing | 10″ in the row × 18″ between rows |
| Planted as | seed |
| Expected yield | 0.5–1 lbs per plant |
| Water | ~1–1.5 in a week |
When to plant
In USDA zone 6, for example: Recommended planting window around Apr 1. Start seeds indoors ~5 weeks earlier.
| Spring | Fall | |
|---|---|---|
| Zone 3 | May 1 | Jun 28 |
| Zone 4 | Apr 23 | Jul 3 |
| Zone 5 | Apr 12 | Jul 16 |
| Zone 6 | Apr 1 | Jul 28 |
| Zone 7 | Mar 18 | Aug 18 |
| Zone 8 | Mar 1 | Sep 2 |
| Zone 9 | Feb 6 | Sep 17 |
Dates are the typical window for each zone's average frost dates — your own last frost can differ by a couple of weeks. Zone 10 and warmer is effectively frost-free: plant to the season, not the frost. Southern Hemisphere: shift six months.
Radicchio Types
- Chioggia · 65 days · 0.5–1 lbs/plant — The round red supermarket head — the quickest and most forgiving.
- Treviso · 75 days · 0.5–1 lbs/plant — Upright romaine-shaped heads — the grilling type; Tardivo, the forced winter version, is a variety.
- Castelfranco · 80 days · 0.5–1 lbs/plant — Cream leaves splashed wine-red — the loose winter rosette; tender and frost-loving.
- Sugarloaf · 85 days · 0.5–1 lbs/plant — Pan di zucchero — tall green heads, the mildest; cellars like a cabbage.
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