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Costata Romanesco Zucchini

Cucurbita pepo

This distinctive zucchini is medium gray-green, with pale green flecks and prominent ribs. Big, large-leafed, semi-vining plants with only about half the yield of hybrids, but much better flavor; clearly better textured, nutty, and delicious, raw or cooked. Also a good producer of heavy male blossoms for cooking. Edible Flowers: Blossoms bear a mild, squash-like flavor and are great stuffed and fried, or sliced for used in soups, omelets, salads, and pasta dishes.

Harvest

52d

Days to harvest

📅

Sun

White-Tailed Deer

☀️

Zones

3–11

USDA hardiness

🗺️

Height

1-3 feet

📏

Planting Timeline

Zone:

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Direct Sow

Harvest

Direct Sow

Harvest

Showing dates for Costata Romanesco Zucchini in USDA Zone 7

All Zone 7 squash →

Zone Map

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Costata Romanesco Zucchini · Zones 3–11

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

Spacing3-4 feet

SoilRich, well-drained soil with plenty of organic matter

pH6.0-7.5

Water1-2 inches per week, consistent moisture

SeasonWarm season annual

FlavorSuperior nutty, sweet flavor with tender, creamy texture

ColorPale green with dark green ribs and stripes

Size6-8 inches length (harvest size)

Zone-by-Zone Planting Calendar

Zone	Indoor Start	Transplant	Direct Sow	Harvest
Zone 3	—	—	June – July	August – October
Zone 4	—	—	June – July	August – October
Zone 5	—	—	May – June	August – September
Zone 6	—	—	May – June	July – September
Zone 7	—	—	April – June	July – August
Zone 8	—	—	April – May	June – August
Zone 9	—	—	March – April	May – July
Zone 10	—	—	February – April	May – June

Complete Growing Guide

Light: White-Tailed Deer. Soil: High Organic Matter, Loam (Silt). Soil pH: Neutral (6.0-8.0). Drainage: Good Drainage, Moist. Height: 1 ft. 0 in. - 3 ft. 0 in.. Spread: 2 ft. 0 in. - 25 ft. 0 in.. Spacing: 12 inches-3 feet. Growth rate: Rapid. Maintenance: var. CylindricaZucchini Squash, var. Cylindrica. Propagation: Seed. Regions: Coastal, Mountains, Piedmont.

Harvesting

A type of berry called a pepo that has a hard rind. Fruits may be long or round, large or small, smooth or warty– some have edible flesh and some are too hard or insipid to eat, though the seeds of all are edible. Has a harder, thicker stem compared to other species.

Color: Black, Cream/Tan, Gold/Yellow, Green, Orange, Pink, Red/Burgundy, Variegated, White. Type: Berry. Length: > 3 inches. Width: > 3 inches.

Garden value: Edible, Showy

Harvest time: Fall

Bloom time: Summer

Storage & Preservation

Fresh Costata Romanesco keeps 5-7 days at room temperature or up to 2 weeks refrigerated in a perforated plastic bag in the crisper drawer. Don't wash until ready to use—moisture accelerates decay. The ribbed surface makes this variety particularly prone to soft spots if stored in humid conditions.

For freezing, slice into rounds or cubes, blanch for 3 minutes, then freeze in meal-sized portions. The tender texture makes this variety excellent for grating and freezing raw for baking—thaw and squeeze out excess moisture before using in zucchini bread.

The superior flavor of Costata Romanesco makes it ideal for fermented relishes or pickles. Try quick-pickling thin rounds with the skin on—the ribs create beautiful striped pickles. Dehydrated chips made from this variety have exceptional flavor and the natural ridges help seasonings adhere better than smooth zucchini varieties.

History & Origin

Origin: North America

Advantages

+Fast-growing

Companion Plants

Plant Together

Nasturtiums

Acts as trap crop for squash bugs and cucumber beetles, repels aphids

Marigolds

Repels cucumber beetles, squash bugs, and nematodes with natural compounds

Radishes

Deters squash vine borers and cucumber beetles, breaks up soil

Beans

Fixes nitrogen in soil benefiting heavy-feeding squash plants

Corn

Provides natural trellis and shade, part of traditional Three Sisters planting

Catnip

Strongly repels squash bugs, cucumber beetles, and flea beetles

Oregano

Repels cucumber beetles and provides general pest deterrent aromatics

Borage

Attracts beneficial insects and may improve growth and flavor of squash

Keep Apart

Potatoes

Compete for similar nutrients and space, both are heavy feeders

Fennel

Inhibits growth through allelopathic compounds and attracts harmful insects

Brassicas

Compete for nutrients and may stunt squash growth due to different soil needs

Nutrition Facts

Calories

21kcal(1%)

Protein

2.71g(5%)

Fiber

1.1g(4%)

Carbs

3.11g(1%)

Fat

0.4g(1%)

Vitamin C

34.1mg(38%)

Vitamin A

25mcg(3%)

Iron

0.79mg(4%)

Calcium

21mg(2%)

Potassium

459mg(10%)

Per 100g serving. % Daily Value based on 2,000 calorie diet. Source: USDA FoodData Central (FDC #168565)

Pests & Disease Resistance

Resistance

Good general disease resistance typical of Italian varieties

Common Pests

Squash bugs, cucumber beetles, aphids

Diseases

Powdery mildew, bacterial wilt, mosaic virus

Frequently Asked Questions

How long does Costata Romanesco zucchini take to grow?▼

Costata Romanesco takes 52-60 days from seed to first harvest. You'll see flowers appear around 35-40 days, with the first harvestable fruits following 10-14 days later. Once production starts, you can harvest continuously for 2-3 months until frost, with peak production occurring 6-8 weeks after planting.

Is Costata Romanesco good for beginners?▼

Yes, Costata Romanesco is excellent for beginners. It's rated as easy to grow, has good disease resistance, and produces abundantly with basic care. The main requirement is consistent watering and harvesting every 2-3 days once production starts. It's actually more forgiving than many hybrid varieties when it comes to soil conditions.

Can you grow Costata Romanesco zucchini in containers?▼

Costata Romanesco can be grown in containers, but needs a large pot—at least 20-25 gallons with excellent drainage. The vines spread 6-8 feet, so you'll need space or plan to train them up a trellis. Container plants require daily watering and bi-weekly fertilizing. Harvest frequency becomes even more critical in containers to maintain production.

What does Costata Romanesco taste like compared to regular zucchini?▼

Costata Romanesco has a distinctly superior flavor—nutty and sweet with a creamy, tender texture that's much less watery than standard zucchini. The flavor is more concentrated and complex, often described as having subtle artichoke-like notes. It maintains this superior taste even when fruits get larger, unlike regular zucchini that become bland and seedy.

When should I plant Costata Romanesco zucchini?▼

Plant Costata Romanesco after soil reaches 60°F and all danger of frost has passed—typically 2-3 weeks after your last frost date. In most areas, this means late May to early June. In zones 9-10, you can plant a second crop in late July for fall harvest. Start indoors 2-3 weeks early if you want to extend the growing season.

Costata Romanesco vs regular zucchini - what's the difference?▼

The main differences are appearance, flavor, and texture. Costata Romanesco has distinctive pale green skin with dark green ribs, while regular zucchini is solid dark green. The flavor is significantly superior—nutty and sweet versus bland. The texture is creamier and less watery. However, regular zucchini varieties often have better pest resistance and are more compact.