Calabrese Green Broccoli Heirloom Seeds

History

Calabrese Green Broccoli is one of the oldest and most beloved heirloom broccolies in the world, originating in the Calabria region of southern Italy — where it has been cultivated for centuries. Italian immigrants brought it to America in the late 19th and early 20th centuries, and it quickly became the standard by which all broccoli was measured. When most Americans picture broccoli, they're picturing Calabrese. It is the heirloom that defined a vegetable category.

Plant Profile

• Days to Maturity: 58–65 days from transplant
• Head Size: 4–8 inches across; large, dense, blue-green central head
• Plant Size: 18–24 inches tall; vigorous, upright habit

Flavor Profile

Calabrese Green delivers the classic broccoli flavor most of us grew up with — rich, slightly earthy, and mildly sweet with a tender bite when harvested young. Steamed, roasted, or eaten raw, it has a clean, satisfying flavor that holds up beautifully in everything from stir-fries to pasta dishes to simple olive oil and garlic preparations.

Growth Type & Harvest Yields

Calabrese is a cut-and-come-again producer. After the large central head is harvested, the plant sends out a generous flush of smaller side shoots that continue producing for weeks — sometimes well into fall. This extended harvest window makes it one of the most productive brassicas you can grow per square foot of garden space.

Disease Resistance

Calabrese Green shows good general vigor and tolerance to common brassica pressures. It performs best in cool weather and can handle light frosts, which actually improve its flavor. Like all brassicas, it benefits from crop rotation to reduce clubroot and downy mildew pressure.

Growing Tips & Planting Dimensions

• Direct sow or transplant in early spring or late summer for a fall crop
• Space plants 18–24 inches apart in rows 24–36 inches apart
• Prefers rich, well-draining soil with consistent moisture and full sun
• Side-dress with compost or balanced fertilizer at transplant and again when heads begin to form
• Harvest central head before flowers open for best flavor and texture
• Keep soil consistently moist — uneven watering leads to hollow stems

When to Start Indoors

Start seeds indoors 6–8 weeks before your last expected frost date for a spring crop, or 10–12 weeks before your first fall frost for a fall harvest. Transplant outdoors when seedlings are 4–6 inches tall and nighttime temps are consistently above 28°F. Check your USDA hardiness zone at planthardiness.ars.usda.gov to dial in your timing.

Companion Plants

• Dill & Chamomile — attract beneficial insects that prey on cabbage worms and aphids
• Nasturtiums — act as a trap crop for aphids, drawing them away from broccoli
• Onions & Garlic — repel cabbage loopers and aphids with their strong scent
• Celery — reported to deter white cabbage moths
• Avoid: Strawberries, Tomatoes, Peppers — compete for nutrients and can inhibit brassica growth

How to Enjoy

Roast florets at 425°F with olive oil, garlic, and a pinch of red pepper flakes until the edges char — this is the preparation that converts broccoli skeptics. Steam lightly and finish with lemon butter. Toss raw into salads or grain bowls. Blanch and freeze for year-round use. Sauté with pasta, white beans, and Parmesan. The side shoots that follow the main harvest are especially tender and sweet — treat them like broccolini.

Why Gardeners Love It

Calabrese Green is the rare heirloom that delivers on every front — reliable germination, impressive yields, extended harvest, and flavor that puts grocery store broccoli to shame. It's a garden workhorse that earns its space every single season. Grow it once and it becomes a permanent fixture in your rotation.

Harvest Tips

• Harvest the central head when it's tight and deep green — before any yellow flowers appear
• Cut at a 45° angle about 5–6 inches down the stem to encourage side shoot production
• Harvest side shoots regularly to keep the plant producing
• Morning harvests yield the crispest, most flavorful heads
• Store unwashed in the refrigerator for up to 5 days, or blanch and freeze for long-term storage

Order Today

Ready to grow the broccoli that started it all? Add Calabrese Green Broccoli Heirloom Seeds to your garden this season and taste the difference an heirloom makes.