Heirloom

Zucchini Costata Romanesco

Cucurbita pepo 'Costata Romanesco'

This stunning Italian heirloom zucchini features distinctive ribbed fruits with alternating dark and light green stripes that make it as beautiful as it is delicious. The tender, flavorful flesh has a nutty sweetness that's prized by chefs and home cooks alike. Both the fruits and large golden blossoms are edible, making this variety a true dual-purpose garden treasure.

Harvest

50-60d

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 Zucchini Costata Romanesco in USDA Zone 7

All Zone 7 squash →

Zone Map

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Zucchini Costata Romanesco · Zones 3–11

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

Spacing36-48 inches

SoilRich, well-drained soil with plenty of organic matter

pH6.0-7.0

Water1-2 inches per week, deep but infrequent watering

SeasonWarm season

FlavorSweet, nutty, and tender with excellent texture

ColorLight green with dark green ribs and stripes

Size6-8 inches long when harvested young

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 stores best unwashed in the refrigerator crisper drawer, wrapped loosely in perforated plastic bags to maintain humidity while allowing air circulation. Properly stored, these zucchini maintain quality for 7-10 days – longer than most smooth varieties due to their firmer flesh. Avoid storing at room temperature for more than 2-3 days, as they'll become rubbery and develop soft spots.

For preservation, slice and blanch for 3 minutes before freezing in airtight containers – the firm texture holds up better to freezing than standard zucchini. Dehydrating works exceptionally well with this variety; slice into 1/4-inch rounds and dehydrate at 135°F for 8-12 hours until crisp. The natural ridges create more surface area for faster drying. For canning, this variety's dense flesh makes excellent pickled zucchini relish using tested recipes with proper acid levels.

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

Deters squash bugs, cucumber beetles, and nematodes with strong scent

Radishes

Repels squash vine borers and cucumber beetles, breaks up soil

Beans

Fixes nitrogen in soil for heavy-feeding zucchini, compact growth fits under leaves

Catnip

Strongly repels squash bugs, cucumber beetles, and ants

Oregano

Repels aphids and provides general pest deterrence with aromatic oils

Corn

Provides vertical structure, part of traditional three sisters planting

Garlic

Deters aphids, squash bugs, and fungal diseases with sulfur compounds

Keep Apart

Cucumbers

Compete for same nutrients and space, attract similar pests like cucumber beetles

Potatoes

Both are heavy feeders competing for nutrients, potatoes can harbor similar fungal diseases

Pumpkins

Cross-pollination concerns and competition for space and nutrients

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

Moderate resistance to common squash diseases

Common Pests

Squash bugs, cucumber beetles, squash vine borers

Diseases

Powdery mildew, downy mildew, bacterial wilt

Frequently Asked Questions

How long does Costata Romanesco zucchini take to grow?▼

Costata Romanesco takes 50-60 days from seed to first harvest. You'll see flowers forming around 40-45 days, with fruits ready to pick about 5-7 days after pollination. For continuous harvest, plant successive crops every 2-3 weeks through midsummer in most zones.

Can you grow Costata Romanesco zucchini in containers?▼

Yes, Costata Romanesco works well in containers due to its compact bush habit. Use containers at least 20 gallons in size with excellent drainage. The confined space actually helps control the plant's spread while still producing good yields of the distinctive ribbed fruits.

What does Costata Romanesco zucchini taste like?▼

Costata Romanesco has a distinctly nutty, sweet flavor that's more complex than regular zucchini. The flesh is firmer and denser with a slightly creamy texture when cooked. It holds its shape well in cooking and doesn't become watery like many standard zucchini varieties.

Is Costata Romanesco zucchini good for beginners?▼

Yes, this variety is beginner-friendly with the same easy care as regular zucchini. The main challenges are finding seeds and paying attention to harvest timing. The compact growth habit actually makes it easier to manage than sprawling squash varieties, and the distinctive appearance makes harvest timing more obvious.

When should I plant Costata Romanesco zucchini?▼

Plant Costata Romanesco after soil temperatures reach 65°F consistently, typically 2-3 weeks after your last frost date. In zones 6-9, plant from late April through July. In cooler zones 3-5, start seeds indoors in early May for transplanting after Memorial Day.

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

Costata Romanesco has distinctive ridged skin with alternating light and dark green stripes, firmer flesh, superior flavor, and better storage life than regular zucchini. However, it produces fewer fruits overall and seeds cost more. The compact plant size and gourmet quality make it worth the trade-offs for many gardeners.