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Botanical Interests

Costata Romanesco Summer Squash Seeds

Costata Romanesco Summer Squash Seeds

Regular price $3.49
Sale price $3.49 Regular price
~0.57 g (~12 seeds)
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Product Details

Costata Romanesco' delivers a manageable harvest of high-quality, fluted fruits with complex flavor and firm texture. The striped and mottled skin stays tender even to 18", though in Italy they are picked at 4"-5" with the blossoms still attached. Large production of male blossoms for stuffing.

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  • Variety Info
  • Sowing Info
  • Growing Info

Variety Info

Days to Maturity: 52–60 days

Family: Cucurbitaceae

Type: Summer Squash (Learn more)

Native: North America

Hardiness: Frost-sensitive annual

Exposure: Full sun

Plant Dimensions: 2'–3' tall and 3'–4' wide

Variety Info: Best harvested under 12". Light gray-green fruits with lighter stripes and distinct ribbing. Good producer of male blossoms for cooking.

Attributes: Frost Sensitive, Good for Containers

Sowing Info

When to Sow Outside: RECOMMENDED. 1 to 2 weeks after your average last frost date, and when soil temperature is 70°–85°F.

When to Start Inside: Not recommended except in very short growing seasons, 2 to 4 weeks before transplanting. Roots are sensitive to disturbance; sow in biodegradable pots that can be planted directly into the ground. Transplant when soil temperature is at least 60°F.

Days to Emerge: 5–10 days

Seed Depth: ½"–1"

Seed Spacing: 2–3 seeds per mound

Row Spacing: 3'–4'

Thinning: When 3 leaves, thin to 1 plant per mound

Growing Info

Harvesting: Harvest frequently to increase yield; squash seem to get monstrous overnight. While edible at almost any size, seeds are less developed in young fruit, therefore more tender. Using a knife or clippers, cut squash off including some of the stem. By including stem, the fruit is sealed and less likely to mold or dry out. Harvesting Blossoms: Look for male, non-fruit producing flowers that have long stems and harvest just before use (female flowers have a swollen mini-squash at the base of the flower and are on shorter stems).

4.2
Rated 4.2 out of 5 stars
Based on 27 reviews
Total 5 star reviews: 19 Total 4 star reviews: 3 Total 3 star reviews: 1 Total 2 star reviews: 0 Total 1 star reviews: 4
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27 reviews
  • Jordan W.
    Rated 5 out of 5 stars
    Mar 3, 2025
    5 Stars

    Ahhahah

  • David ..
    Rated 5 out of 5 stars
    Jul 28, 2024
    5 Stars

    After a couple of seasons this is the only zucchini type squash I grow almost every year. The flavor is better than the other store bought or home grown zucchinis I've tried, but the best part is the male flowers. They are huge, as flavorful as smaller varieties, and so easy to stuff with feta or soft goat cheese (melty cheeses like mozzarella will just leak out into the hot oil). Dip into a simple tempura batter (flour and very cold plain or fizzy water) and deep fry.

  • Allen
    Verified Buyer
    Rated 1 out of 5 stars
    May 9, 2022
    1 Star

    I only have 6 seeds in my 1.5 gram packet

  • Lynn
    Verified Buyer
    Rated 5 out of 5 stars
    May 9, 2022
    5 Stars

    They're so pretty and easy to grow, and no matter the size you pull them they have the same wonderful texture and tender skin. I'm tending only one plant for space reasons, but this has led to the one issue with it, which is the male and female blossoms don't always sync and occasionally I have to pull apart a male blossom that's closing in order to hand pollinate a female that's ready. Nevertheless I love this squash and will grow it again.

  • Bonnie
    Verified Buyer
    Rated 5 out of 5 stars
    May 9, 2022
    5 Stars

    We enjoyed this attractive squash all summer. It produced quickly and lasted a long time.