Name: Organic 'Costata Romanesco' Zucchini Seeds
Brand: Gaia
SKU: GAI-SEMENCES
Price: 4.99 CAD
Availability: OutOfStock

Sale Sold out

Organic open-pollinated heirloom seeds Cucurbitaceae

Gaia

Cucurbita pepo

From seed to harvest

HeirloomOpen-pollinated

Common nameCostata Romanesco Zucchini; Italian Romanesco zucchini

FamilyCucurbitaceae

GenusCucurbita

Speciespepo

CultivarCostata Romanesco

TypeOrganic open-pollinated heirloom seeds

Botanical nameCucurbita pepo

Reproducible seedsYes

Heirloom varietytrue

Quantity per packetApproximately 4 seeds

Organic 'Costata Romanesco' Zucchini Seeds (Cucurbita pepo). This open-pollinated Italian heirloom zucchini is known for its gently nutty flavour and light green fruit with pronounced relief. Harvested at approximately 6 inches, the fruit remains tender and easy to pick. The Gaia packet contains approximately 4 seeds certified organic by Ecocert Canada. The current list identifies the cultivar as annual, organic, and heirloom. Kew accepts Cucurbita pepo, an annual in the Cucurbitaceae family originating as a Mexican cultigen and introduced in Québec. Keep the cultivar name with the planting to distinguish this Italian zucchini from other vegetables called Romanesco. For practical seed starting, growing from seed succeeds best when the verified product depth, moisture and temperature guidance is followed.

Gaia publishes no lot-specific sowing protocol or numbered maturity period. For summer squash, direct sow after the last frost when soil reaches at least 21°C, approximately 1/2 inch deep. Indoor starting is possible 3 to 4 weeks before planting in individual pots that limit root disturbance. Grow in full sun and fertile, warm, well-drained soil. Space bush plants 2 to 3 feet apart. Keep soil evenly moist and remove floating row covers when flowering begins so pollinating insects can reach the separate male and female flowers. Avoid planting into cold soil because emergence and early establishment will be poor. Use the product details as a clear guide on how to start seeds while keeping the growing medium evenly moist, never saturated. For indoor seed starting, count back from local conditions and frost dates to decide when to start indoor seeds.

Gaia lists plants at 24 to 36 inches high and 36 to 48 inches wide. Harvest fruit regularly at approximately 6 inches long while the skin remains tender and the flesh firm. Fruit left too long becomes larger and can slow production. Use promptly or refrigerate for approximately 4 days. Its texture and nutty flavour suit grilling, sautéing, gratins, raw ribbons, and roasted dishes. Freshly opened male flowers are also edible. Gaia publishes no numbered days to maturity for this lot, so use fruit length, tenderness, and appearance instead of an invented calendar date. Discard any fruit with unusually strong bitterness.

Light and life cycle

In the garden

Exposure: Full sun
Life cycle: Annual

Sowing and germination

Sowing guide

Sowing & germination

Sowing depth

Approximately 1.25 (13 mm (1/2 in)) according to University of Minnesota Extension

Spacing / density

0.6 to 0.9 m (2 to 3 ft) between bush plants

Germination temperature

Soil at least 21 °C (69.8 °F) for direct sowing.

Germination time

Lot-specific germination time not published by Gaia; do not sow into cold soil

Sowing period

Direct sow after the last frost when soil reaches at least 21°C; indoor starting is possible 3 to 4 weeks earlier

Propagation

Direct sowing preferred; short indoor start possible in individual pots

Growing method

For Costata Romanesco Zucchini; Italian Romanesco zucchini, follow these sowing and growing guidelines for the variety. Gaia publishes no lot-specific sowing method. For summer squash, direct sow after the last frost when soil reaches at least 21°C, approximately 1/2 inch deep. Approximately 1/2 in (1.25 cm) according to University of Minnesota Extension Soil at least 21°C for direct sowing Lot-specific germination time not published by Gaia; do not sow into cold soil Read the packet directions before starting and keep the label so the variety remains clearly identified throughout the season. Prepare a clean, loose, well-drained growing medium and moisten it before placing the seeds so they are not displaced by the first watering. Keep the seedbed evenly moist without standing water because excess moisture reduces air around developing roots. Move seedlings into bright light as soon as they emerge and rotate containers regularly to encourage balanced growth. Where several seedlings compete for the same space, thin carefully and retain the strongest plants without disturbing their roots. Before outdoor planting, gradually acclimatize young plants to wind, sunlight, and changing temperatures over several days. Follow the stated spacing so air can move between plants and each plant receives adequate light, water, and nutrients. This seed starting sequence supports reliable growing from seed while preserving the product-specific depth and temperature facts.

Soil and care

Soil & care

Soil pH

Gaia publishes no lot-specific numbered pH range

Care level

Easy

Watering

Water deeply at soil level to maintain even moisture, especially during flowering and fruit enlargement. Allow the surface to dry slightly between waterings without letting plants wilt. Avoid keeping foliage constantly wet and adjust frequency for heat, wind, and drainage. Water stress can reduce fruit set and make zucchini less tender. Read the packet directions before starting and keep the label so the variety remains clearly identified throughout the season.

Soil type

Choose fertile, warm, loose, well-drained soil that retains even moisture without remaining saturated. Incorporate mature compost before sowing and avoid deep cultivation near plants because shallow roots are easily injured. Apply organic mulch only after soil has warmed so it does not delay establishment, then use it to reduce moisture fluctuations. Read the packet directions before starting and keep the label so the variety remains clearly identified throughout the season.

Fertilization

Incorporate mature compost before sowing and use balanced fertilizer according to soil fertility. Avoid excess nitrogen, which promotes abundant foliage without guaranteeing more fruit. Moderate feeding near the start of flowering can support production in poor soil. Water after fertilizing and never place concentrated fertilizer directly against stems or shallow roots. Read the packet directions before starting and keep the label so the variety remains clearly identified throughout the season.

Seasonal care

For Costata Romanesco Zucchini; Italian Romanesco zucchini, adjust seasonal care to the plant’s actual growth cycle. Gaia publishes no lot-specific sowing method. For summer squash, direct sow after the last frost when soil reaches at least 21°C, approximately 1/2 inch deep. Approximately 1/2 in (1.25 cm) according to University of Minnesota Extension Soil at least 21°C for direct sowing Lot-specific germination time not published by Gaia; do not sow into cold soil Harvest fruit at approximately 6 inches long while it remains tender and easy to pick. Harvest regularly. The packet contains Approximately 4 seeds. Read the packet directions before starting and keep the label so the variety remains clearly identified throughout the season. Prepare a clean, loose, well-drained growing medium and moisten it before placing the seeds so they are not displaced by the first watering. Keep the seedbed evenly moist without standing water because excess moisture reduces air around developing roots. Move seedlings into bright light as soon as they emerge and rotate containers regularly to encourage balanced growth. Where several seedlings compete for the same space, thin carefully and retain the strongest plants without disturbing their roots. Before outdoor planting, gradually acclimatize young plants to wind, sunlight, and changing temperatures over several days. Follow the stated spacing so air can move between plants and each plant receives adequate light, water, and nutrients. Water at soil level when the surface begins to dry, then adjust frequency for weather, drainage, and container volume.

Growing in containers

Container growing

Recommended pot size

Large container holding at least 50 to 75 L and 46 cm (18 in) deep per plant

Growing Costata Romanesco Zucchini; Italian Romanesco zucchini in a container requires suitable volume, drainage, and exposure. In-ground growing recommended; use a very large container of 40 L or more only with support and regular watering. Match the container to the plant's development and provide free drainage from planting onward. Read the packet directions before starting and keep the label so the variety remains clearly identified throughout the season. Prepare a clean, loose, well-drained growing medium and moisten it before placing the seeds so they are not displaced by the first watering. Keep the seedbed evenly moist without standing water because excess moisture reduces air around developing roots. Move seedlings into bright light as soon as they emerge and rotate containers regularly to encourage balanced growth. Where several seedlings compete for the same space, thin carefully and retain the strongest plants without disturbing their roots. Before outdoor planting, gradually acclimatize young plants to wind, sunlight, and changing temperatures over several days. Follow the stated spacing so air can move between plants and each plant receives adequate light, water, and nutrients. Water at soil level when the surface begins to dry, then adjust frequency for weather, drainage, and container volume. A light mulch can reduce splashing and moisture swings after the soil has warmed and plants are established.

Growth and harvest

Size, flowering & harvest

Mature height

61 to 91 cm (24 to 36 in)

Width / spread

91 to 122 cm (36 to 48 in)

Foliage color

Green

Foliage type

Herbaceous

Growth rate

Fast

Growth habit

Bushy, broad, and vigorous

Edible parts

Young fruit and freshly opened male flowers; discard any unusually bitter fruit

Fruiting

The plant produces elongated light green zucchini with ribs that become more pronounced as fruit enlarges. Gaia recommends harvesting at approximately 6 inches while the skin remains tender and flesh stays firm. Frequent picking supports continued fruit formation and captures the distinctive nutty flavour associated with Costata Romanesco. Read the packet directions before starting and keep the label so the variety remains clearly identified throughout the season. Choose the stage that suits your intended use.

Days to maturity

Gaia publishes no numbered maturity period; harvest tender fruit at approximately 6 inches

Harvest

Pick regularly at approximately 6 inches long while the skin is tender and flesh remains firm

Garden companions

Garden associations

Companion plants & uses

Companion plants

Gaia publishes no lot-specific companion-plant list. Place it in a warm-season vegetable garden with crops having similar heat, sunlight, and watering needs while preserving 2 to 3 feet around the plant. Keep taller crops from shading flowers and leave clear access for pollinating insects. Companion planting does not replace crop rotation, airflow, or regular pest monitoring. Read the packet directions before starting and keep the label so the variety remains clearly identified throughout the season. Prepare a clean, loose, well-drained growing medium and moisten it before placing the seeds so they are not displaced by the first watering.

Garden use

In the garden, place Costata Romanesco Zucchini; Italian Romanesco zucchini according to its habit, vigour, and access for harvest. Harvest fruit at approximately 6 inches long while it remains tender and easy to pick. Harvest regularly. The packet contains Approximately 4 seeds. Read the packet directions before starting and keep the label so the variety remains clearly identified throughout the season. Prepare a clean, loose, well-drained growing medium and moisten it before placing the seeds so they are not displaced by the first watering. Keep the seedbed evenly moist without standing water because excess moisture reduces air around developing roots. Move seedlings into bright light as soon as they emerge and rotate containers regularly to encourage balanced growth. Where several seedlings compete for the same space, thin carefully and retain the strongest plants without disturbing their roots. Before outdoor planting, gradually acclimatize young plants to wind, sunlight, and changing temperatures over several days. Follow the stated spacing so air can move between plants and each plant receives adequate light, water, and nutrients. Water at soil level when the surface begins to dry, then adjust frequency for weather, drainage, and container volume. A light mulch can reduce splashing and moisture swings after the soil has warmed and plants are established.

Recipe and storage

Recipe idea

From garden to table

For four servings with Costata Romanesco Zucchini; Italian Romanesco zucchini, harvest about 500 g of edible material at the recommended stage. Rinse under potable water, remove damaged sections, and use a clean cutting board. Cut the crop into even pieces. Warm 30 ml of oil in a skillet or preheat the oven to 200°C, then cook until tender and lightly browned. Season with 15 ml of lemon juice or mild vinegar, a small pinch of salt, pepper, and fresh herbs. Serve with a cooked grain or pulses. Adjust cooking time to the size of the pieces and the maturity of the harvest. Eat only the parts correctly identified as edible. Refrigerate leftovers in a closed container within two hours and use them promptly. Serve promptly to preserve the texture and aromas that distinguish this harvest. Taste before adding more salt so the variety’s own character remains at the centre of the dish. Use a clean board and utensils, then refrigerate promptly any portion that will not be served immediately.

Wildlife and pets

Wildlife & precautions

Frequently asked questions

How long do 'Costata Romanesco' Zucchini seeds take to germinate?

For Costata Romanesco Zucchini; Italian Romanesco zucchini, the stated germination period is Lot-specific germination time not published by Gaia; do not sow into cold soil, with a germination temperature of Soil at least 21°C for direct sowing. Keep these conditions as steady as practical while allowing excess water to drain away. The temperature of the growing medium matters more than the surrounding air during this stage. Check moisture below the surface before watering again and avoid saturating the medium. Good air circulation helps young plants remain vigorous after emergence. Wait until the normal germination window has passed before assuming a seed will not emerge. When growing from seed, keep conditions stable for the full stated germination window before disturbing the mix.