Narrowleaf Cow-wheat Plant Care

Narrowleaf Cow-wheat (Melampyrum lineare) belongs to the Orobanchaceae family within the Melampyrum genus. Narrowleaf Cow-wheat is native to North America. Narrowleaf Cow-wheat is also known as Linearleaf Cow-wheat.

Narrowleaf Cow-wheat displays a low rosette, spreading growth habit, reaching up to 0.5 ft tall with a spread of approximately 0.5 ft. Narrowleaf Cow-wheat produces small tubular flowers in shades of purple or white.

Leaf size: approximately 2 inches.

Water a young or newly planted Narrowleaf Cow-wheat 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.

Narrowleaf Cow-wheat thrives in partial shade to full shade. The optimal light range is 100–500 lux. Avoid placing Narrowleaf Cow-wheat in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Melampyrum lineare tolerates temperatures of 50–75°F. Narrowleaf Cow-wheat prefers humidity levels of 40–60%.

Well-draining loamy soil with added organic matter. Good drainage is essential for Narrowleaf Cow-wheat to prevent waterlogging, which leads to root rot and fungal issues.

Feed Narrowleaf Cow-wheat 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 partial shade to full shade and well-draining loamy soil with added organic matter. Avoid low spots where water collects after rain.

Narrowleaf Cow-wheat 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.

Narrowleaf Cow-wheat 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 Narrowleaf Cow-wheat 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.

Narrowleaf Cow-wheat 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.

Narrowleaf Cow-wheat can be propagated through seeds. Similar propagation techniques also apply to field cow-wheat plant care, which shares the same genus.

See all plants toxic to cats and plants toxic to dogs.

Narrowleaf Cow-wheat is susceptible to aphids, spider mites, leaf miners. 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.

Narrowleaf Cow-wheat grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Narrowleaf Cow-wheat is native to North America. In cooler regions, grow Narrowleaf Cow-wheat as a houseplant or bring it indoors before the first frost.