Cavolo nero is the backbone of Tuscan winter cooking. The long, narrow, deeply blistered leaves are almost black green, and the flavour is rich, earthy, and slightly sweet.
Here is the thing most people do not know: it tastes better after a frost. The cold converts starches to sugars, and the leaves turn sweeter and more tender. Which makes it perfect for Irish winters.
Plants reach 60 to 90cm tall and keep producing leaves for months. Pick from the bottom up, and the plant keeps growing new leaves at the top.
🌱 Sowing information
Sow May to July in modules or trays, about 1 to 1.5cm deep. Transplant when seedlings are 15 to 20cm tall. Can also be sown directly where it is to grow, thinning to final spacing once seedlings are established.
☀️ Light exposure
Full sun for the best flavour, though cavolo nero tolerates partial shade better than most brassicas. An open position with good air circulation helps prevent fungal problems.
💧 Water needs
Keep soil evenly moist, especially during dry spells. Kale is tougher than most vegetables once established, but consistent watering produces more tender, less bitter leaves. Feed occasionally with a general purpose fertiliser.
🌡️ Germination temperature and time
Seeds germinate in 7 to 12 days at 10 to 20°C. Cavolo nero is straightforward to germinate and not fussy about temperature. Sow from May onwards in Ireland for autumn and winter harvests.
📏 Plant spacing and final size
Space plants 45 to 50cm apart. They grow 60 to 90cm tall with an upright habit. The lower leaves spread about 40cm wide. No support needed unless very exposed to wind.
🌼 Harvesting notes
Harvest autumn through winter, picking individual leaves from the bottom up as needed. The plant keeps producing new leaves at the top. Flavour improves markedly after the first frosts. A single plant can produce leaves for 6 months or more.
🍽️ In the kitchen
Ribollita (Tuscan bread soup), sautéed with garlic and chilli, stirred into bean stews, or massaged raw with olive oil and lemon for a winter salad. Remove the central rib before cooking.
📖 Not sure what to cook with your harvest? Our recipe guide “Welly to Belly: The Italian Vegetable Garden” is full of simple Italian recipes for exactly what you are growing. Get your copy and start cooking with what you grow.
Technical Data
🌱 Sowing depth: 1 to 1.5cm
📅 Sow: May to July. Harvest: autumn through winter
☀️ Light: Full sun to partial shade
🌡️ Germination: 7 to 12 days at 10 to 20°C
📏 Height: 60 to 90cm. Space: 45 to 50cm
🪴 Cold hardy: yes, improves after frost
⏳ Days to first harvest: approx. 60 to 75 days from transplant
🧪 Approx. seed quantity: 8g per packet
Heritage variety from Franchi Sementi, est. 1783. Open pollinated, OGM free.
