Costata Romanesco Zucchini, 1600's Heirloom | Disease Resistant | Borer Resistant

The Costata Romanesco is an ancient Italian Heirloom from the Lazio region around Rome. It belongs to the Cocozelle group of squashes, which have been cultivated in Italy for centuries.

While most modern zucchini were bred for machine harvesting and uniform "log" shapes, the Romanesco was bred for the plate. Italian gardeners selected this variety for its superior culinary qualities and its ability to produce an abundance of large, sturdy male blossoms—a staple of Italian cuisine (traditionally stuffed with ricotta and fried). It remains a symbol of the traditional Roman kitchen garden (orto) and has gained a cult following globally among organic farmers and farm-to-table chefs.

• Gourmet Flavor: Deeply nutty and sweet; it contains less water than standard zucchini, allowing it to brown and caramelize beautifully.
• Distinctive Beauty: Striking medium-green skin with pale green flecks and prominent ribs that create beautiful star-shaped cross-sections.
• Flower Power: Renowned for producing more male blossoms than almost any other variety, making it the top choice for "squash blossom" recipes.
• Heirloom Vigor: A large, prehistoric-looking plant with massive leaves that provides excellent shade for its fruit, preventing sunscald.

1. When to Plant:
Zucchini are heat-lovers. Direct sow seeds outdoors only after the soil has warmed to at least 70°F and all danger of frost has passed.

2. Give it Room:
Unlike compact hybrid zucchinis, the Costata Romanesco is a vigorous grower.

• Spacing: Plant seeds or transplants 3 feet apart. The plants can easily spread 4–5 feet wide.
• Mounds: Many gardeners prefer "hill planting"—sowing 2–3 seeds in a small mound of soil, then thinning to the strongest plant.

3. Soil & Fertilization:

• Squash are "heavy feeders." Prepare your bed with a generous amount of compost or aged manure.
• Keep the soil consistently moist. Mulching around the base of the plant helps retain moisture and keeps the heavy fruits off the direct dirt.

4. Pollination:
Like all squash, this variety has separate male and female flowers on the same plant and relies on bees for pollination. If you see fruit shriveling and falling off early, it may be due to poor pollination; encourage bees by planting flowers like Zinnias or Borage nearby!

5. Harvesting:

• For Flavor: Harvest the "ribbed" fruits when they are between 6 and 10 inches long. While they remain edible even when they grow quite large, the flavor is most intense when they are young.
• For Blossoms: Pick the male flowers (those on long, thin stems) in the early morning while they are still open.

The ribs on the Costata Romanesco aren't just for looks—they give the squash a "bite" and structural integrity. It is the absolute best variety for grilling, as it holds its shape on the grates, and it is superior for "Zoodles" (zucchini noodles) because it doesn't release as much liquid as other varieties.

Garden Tip: Don't panic if your first few flowers don't produce fruit! Zucchini plants typically produce male flowers first to attract pollinators to the area before the female flowers (which have the tiny fruit at the base) appear. 🐝