Photo by Melody

PlantFiles: Zucchini, Courgette, Summer Squash
Cucurbita pepo 'Costata Romanesco'

Family: Cucurbitaceae (koo-ker-bih-TAY-see-ee) (Info)
Genus: Cucurbita (koo-KER-bih-ta) (Info)
Species: pepo (PEP-oh) (Info)
Cultivar: Costata Romanesco

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4 vendors have this plant for sale.

5 members have or want this plant for trade.

Zucchini (summer)

18-24 in. (45-60 cm)

24-36 in. (60-90 cm)
36-48 in. (90-120 cm)

Days to Maturity:
51 to 60 days

Mature Skin Color:
Medium Green

4 to 6 pounds (2 to 3 kg)
7 to 11 pounds (3 to 5 kg)


Disease Resistance:
Powdery Mildew (PM)

Seed Type:
Open Pollinated

Other details:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Propagation Methods:
From seed; direct sow after last frost

Seed Collecting:
Allow unblemished fruit to ripen; clean and dry seeds

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By QueenB
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5 positives
2 neutrals
No negatives

Gardeners' Notes:

Positive elsutor On May 19, 2014, elsutor from Penn Hills, PA wrote:

Huge, susceptible to mildew, and I abhor SVB, which adore this plant! Nonetheless, this variety has won me over. It is worth it all!

Absolutely the tastiest zucchini I have ever had!

This year I will be growing it again, monitoring carefully for SVB intrusions, battering flowers, cursing the thing when it gets huge. It does resist SVB and I have cut the worms out with (mostly) success. I am going to try using DE this year to ward off the buggers.

I am tempted to try to grow it vertically with a large tomato support, as well, to conserve garden space, increase air circulation, and to be able to monitor for bugs a little better.

Positive BettinaW On Jul 28, 2009, BettinaW from Salt Lake City, UT wrote:

I have grown some version of this squash for over 10 years. I get my seeds from Johnny’s and a packet lasts 3 – 4 years. And each year I search for a similar tasting squash without the huge footprint others have already commented on. Without success. I have found no way to control the growth although it is pretty tough and every so often I just hack it back.

It produces fewer fruit than other summer squash but you can let them get larger without losing flavor or having them get seedy. You can stuff and bake them and they freeze beautifully for winter sauces. In a pasta sauce they retain their flavor and crunchy texture. This year I tried a small round squash with a civilized habit but the taste was not there so I planted another hill of Costata. Maybe a 3 month growing season will cause it to not take over so much real estate in the garden.

If you have the room try this squash.

Neutral JodyC On Nov 15, 2006, JodyC from Palmyra, IL (Zone 5b) wrote:

The name means Ribbed was not bred for eating but for the numerous blossoms for battering and's a delicacy in Italy.Can be grown for a winter squash at about 90 days or a summer squash at about 60 days.Full grown squashes can reach 2 praised for being tender and tasty even when large.

Positive kabocha On Jul 13, 2006, kabocha from Alpine, TX (Zone 7b) wrote:

The only zucchini I want to grow - because of the flavor. Last year I gave it too much manure/coffee grounds and it became too huge with scanty production. I had planted it in a bed and tried to get it to grow up to save space - it definitely did not want to do this - heavy and pendulous, awkward. This year I gave it its own space, less rich food and we have more squash. I notice that it does not get powdwey mildew. A great vegetable - cook with olive oil and garlic.

Positive PurplePansies On Jul 8, 2005, PurplePansies from Deal, NJ (Zone 7a) wrote:

Costata di Romanesco is an heirloom Italian squash. (zucchini). It is said to be the best tasting squash in the world. It is also a prolific producer of male blossoms (for frying/eating etc.). A large sprawling plant. Not compact at all. Easy to grow as other zucchini. I've noticed no problems on mine. Fast maturing as other zucchini as well. Fruits are striped and dark green. :)

Positive QueenB On May 26, 2005, QueenB from Shepherd, TX (Zone 8b) wrote:

This is a huge plant with huge squash to go with it. The great thing is that the fruits can get quite large and still be very tender. The only drawbacks that I can see is if you have very limited space to garden since the leaves can be up to 15 in. wide and 18 in. long, and it is a low-yielding variety. Excellent flavor.

Neutral Farmerdill On Jan 30, 2005, Farmerdill from Augusta, GA (Zone 8a) wrote:

A 52 day Italian zucchini available from Harvest Moon.


This plant has been said to grow in the following regions:

Emerald Lake Hills, California
Los Angeles, California
San Marcos, California
Thousand Oaks, California
Hilo, Hawaii
Coeur D Alene, Idaho
Pittsburgh, Pennsylvania
Alpine, Texas
Houston, Texas
Shepherd, Texas
Salt Lake City, Utah

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