Organic Romanesco Broccoli Seeds - Brassica oleracea

Organic, Non-GMO Open Pollinated Romanesco Broccoli Seeds

Organic Romanesco Broccoli is one of the most striking vegetables you can grow in the garden. This beautiful heirloom produces lime-green heads made of mesmerizing spiral florets, creating a natural fractal pattern that sits somewhere between broccoli and cauliflower in both appearance and flavor.

Beyond its stunning beauty, Romanesco is prized for its mild, slightly nutty taste and tender texture, making it a favorite in the kitchen. The firm, compact heads are perfect for roasting, steaming, sautéing, or enjoying fresh, and they hold their shape beautifully when cooked. In addition to its culinary appeal, Romanesco broccoli is a nutritional powerhouse, rich in vitamin C, fiber, antioxidants, and essential minerals.

Romanesco thrives in cool-season gardens, growing best in full sun and fertile, well-drained soil with consistent moisture. Plants develop large, architectural heads typically 5–7 inches across, surrounded by broad blue-green leaves that protect the developing florets. Harvest the central head while it is tight and well-formed, cutting several inches below the crown. After the main head is harvested, plants often produce smaller side shoots, extending the harvest for weeks.

This extraordinary vegetable brings together beauty, flavor, and nutrition, making it a standout addition to any garden. Whether you are growing for the table, the farmers market, or simply the joy of cultivating something truly unique, Romanesco broccoli delivers both visual wonder and exceptional taste.

Seed Profile 

• Organic

• Heirloom 

• Open-Pollinated

• Non-GMO

• Annual

• Exposure : Full Sun

• Direct Sow: After last frost

• Indoor: 6 weeks before last frost

• Seed Count: 100

• Days to Maturity: 60-80

• Plant Size: 12"-18"

Gardener's Tips

Keep soil moist while seeds are germinating. Thin to healthiest seedlings. Thrives in cool weather. Amend with compost.

Apply mulch at base.

Read our blog post on The Power of Mulching

If starting seeds indoors, it is key that your new starts be hardened off.  This is a process that requires taking them outside during the day, for a period of time, before they are planted. This acclimates your seedlings to the outside world, meaning the elements like the wind and sun. We do it for several weeks to a month as this strengthens their stems and overall plant structure. 

• Start for a short period of time initially, then graduate to more time each day
• One week minimum is recommended
• Bring them inside in the early evening and overnight
• Keep an eye on them and constantly water them. Make sure they have not blown over. 

Harvest when the main head is firm and well-formed, with tightly packed spirals and a bright chartreuse color.
Avoid waiting too long, once florets start to separate or loosen, the quality declines quickly.

Harvesting Tips

• Head diameter around 4–8 inches 

• Compact, dense head with pointed fractal florets.

• No flowering (bolting).  Yellow petals indicate it’s past peak.

• Use a clean and sharp knife or garden shears.

• Cut the stem about 5" – 6" below the head.

• Harvest in the cool part of the day for best quality (morning is ideal after the dew has dried).