Tronchuda Kale in a wood box on a white background.
Kale Seeds, Tronchuda
A head of Tronchuda kale with a bowl of kale salad in the background.
Close-up Tronchuda Kale showing detail in veining.
Kale salad in bowl on top of a single leaf of Tronchuda Kale.
A head of Tronchuda kale with a bowl of kale salad on the right
Tronchuda Kale in a wood box on a white background.
Kale Seeds, Tronchuda
A head of Tronchuda kale with a bowl of kale salad in the background.
Close-up Tronchuda Kale showing detail in veining.
Kale salad in bowl on top of a single leaf of Tronchuda Kale.
A head of Tronchuda kale with a bowl of kale salad on the right

Kale Seeds,
Tronchuda

4.324 ReviewsSKU: #KA107Min. seed count: 250
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Description

(Brassica oleracea var. tronchuda). Tronchuda is the most tender, leafy brassica we have tasted, with a history that traces back to the ancient Celts who once lived on the western coast of the Iberian Peninsula. It is an essential ingredient in Caldo Verde, the national dish of Portugal. Couve Tronchuda is so beloved in Portugal that it enjoys protected status as a cultural treasure. The large, white-ribbed leaves are tender enough to eat raw in salads. Cooked, their texture resembles spinach more than kale. Unlike kale and collards, however, Couve Tronchuda does not tolerate frost.

Growing Tips: Tronchuda kale is more heat-tolerant than many other kale varieties, making it a good choice for different climates. It grows best in well-drained, fertile soil with a pH between 6.0 and 7.5. For best results, plant it in a location that receives full sun, although it can tolerate partial shade.

Plant Details

Botanical Name
Brassica oleracea var. tronchuda
Life Cycle
Biennial
Sun Requirement
6–12 hr.
Days to Germinate
6–9
Days to Maturity
80–85
Planting Depth
¼ in.
Plant Spacing
8 in.
Ideal Temperature
45–85°F
Frost Hardy
No

When to Grow

While Tronchuda kale grows best in cool weather, it is more heat-tolerant than other kale varieties. Plant it out only after the danger of frost has passed, while the weather is still cool, since this is the one leafy brassica here that does not tolerate frost; or sow in late summer, about 12-13 weeks before your first expected fall frost, so the plants size up and are harvested before frost arrives. The plant takes about 80-85 days to reach maturity, depending on the growing conditions. If you're not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

How to Sow and Plant

Sow Tronchuda kale seeds directly into the garden about 1/4 inch deep. Space the plants 8 feet apart to accommodate their large size. This kale can also be started indoors 4-6 weeks before the last frost date and transplanted outside once the soil is workable. It grows best in well-drained soil with a pH between 6.0 and 7.5.

How to Grow

Tronchuda Kale requires consistent moisture; water the plants about 1 to 1.5 inches per week. Mulching around the plants helps to retain moisture and regulate soil temperature. It doesn’t tolerate frost like other varieties. This kale benefits from a balanced fertilizer, especially in soils low in organic matter​.

How to Save Seeds

  • Like all cabbage family members, kale is biennial.
  • Kale is insect pollinated and will cross with some closely related cabbage family members, so it is wise to isolate varieties at least a mile apart to ensure pure seed. Other techniques such as alternate day caging can be used if isolation is not possible.
  • You will need to overwinter plants to harvest seeds. Mulch plants heavily with straw or cover with row cover and greenhouse plastic in an attempt to nurse plants through the winter. You can also dig up plants and store them inside to replant in spring.
  • When the flower spikes emerge in the second year, let the seed pods dry to brown and cut off the entire flower spike.
  • Hang flower stalks upside down indoors over a tarp, allowing the seeds to drop onto the tarp.
  • Seeds will remain viable for up to 4 years.

FAQ

Is Tronchuda Kale suitable for container gardening?

Yes, it can be grown in containers. Use a pot that is at least 12 inches deep and wide to provide enough space for the plant to grow. Make sure that the container has good drainage and fill it with a nutrient-rich potting mix.

How can I use Tronchuda kale in cooking?

Tronchuda Kale has many uses in the kitchen and can be used in a variety of dishes. It is commonly used in Portuguese soups, such as Caldo Verde because of its mild and slightly sweet flavor. The thick leaves can also be sautéed, steamed, or added to salads, providing a delicious and nutritious addition to meals.

Does Tronchuda kale attract pests?

Like other Brassicas, Tronchuda kale can attract pests such as aphids, cabbage loopers, and cabbage worms. Regular inspection and the use of organic pest control methods, such as neem oil or insecticidal soap, can help manage these pests. Planting companion plants that repel pests, such as marigolds or nasturtiums, can also be beneficial.

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