American wintercress Plant Care

American wintercress (Barbarea orthoceras) belongs to the Brassicaceae family within the Barbarea genus. American wintercress is native to North America, including much of Canada and the western United States, as well as parts of Asia. American wintercress is also known as Wintercress.

American wintercress displays a low rosette, spreading growth habit, reaching up to 0.5 ft tall with a spread of approximately 0.5 ft. American wintercress produces small yellow flowers in clusters.

Leaf size: approximately 2 inches.

Water a young or newly planted American wintercress every 3–5 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established shrubs mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

American wintercress thrives in full sun to partial shade.

Barbarea orthoceras tolerates temperatures of 50–75°F. American wintercress prefers humidity levels of 40–70%.

Moist, well-draining soil rich in organic matter. Good drainage is essential for American wintercress to prevent waterlogging, which leads to root rot and fungal issues.

Feed American wintercress every 6 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established shrubs in good soil often need little extra feeding, so let weak growth or pale foliage guide you.

Stop feeding by late summer so new growth can harden before winter.

The PlantoScan app can remind you when to water and when to fertilize each plant.

Choose a spot with full sun to partial shade and moist, well-draining soil rich in organic matter. Avoid low spots where water collects after rain.

American wintercress is suited to USDA Zone 12a.

Plant container-grown or balled-and-burlapped shrubs in spring or early autumn, setting the root flare at soil level, and water well after planting.

American wintercress can spread to about 1 ft (0.2 m) and reach about 1 ft (0 m) tall. Space plants about 1 ft (0.2 m) apart so mature crowns don't crowd each other, and plant at least half that distance from buildings, fences and paths.

Planning a row or hedge? Try the plant spacing calculator.

Prune American wintercress while it is dormant in late winter: first remove dead, damaged and crossing branches, then thin lightly for shape.

If it flowers in spring, prune right after flowering instead so you don't remove next year's buds. Never take off more than about a quarter of the shrub in one year.

American wintercress is frost-tender (hardy to USDA zone 12). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

American wintercress can be propagated through seeds. Similar propagation techniques also apply to intermediate winter cress plant care, which shares the same genus.

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American wintercress is susceptible to aphids, flea beetles, cabbage worms. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.

American wintercress grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. American wintercress is native to North America, including much of Canada and the western United States, as well as parts of Asia. In cooler regions, grow American wintercress as a houseplant or bring it indoors before the first frost.