Old Plainsman Plant Care

Old Plainsman (Hymenopappus scabiosaeus) belongs to the Asteraceae family within the Hymenopappus genus. Old Plainsman is also known as Hymenopappus, Hymenopappus scabiosaeus.

Old Plainsman displays a low mound, spreading growth habit, reaching up to 1.5 ft tall with a spread of approximately 2 ft. Old Plainsman produces small daisy-like flowers in shades of white, pink, or purple.

Leaf size: approximately 2 inches.

Water a young or newly planted Old Plainsman every 7–10 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.

Old Plainsman thrives in full sun.

Hymenopappus scabiosaeus tolerates temperatures of 50–85°F. Old Plainsman prefers humidity levels of 40–60%.

Well-draining sandy loam with added organic matter. Good drainage is essential for Old Plainsman to prevent waterlogging, which leads to root rot and fungal issues.

Feed Old Plainsman 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 and well-draining sandy loam with added organic matter. Avoid low spots where water collects after rain.

Old Plainsman 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.

Old Plainsman can spread to about 2 ft (0.6 m) and reach about 2 ft (0 m) tall. Space plants about 2 ft (0.6 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 Old Plainsman 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.

Old Plainsman 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.

Old Plainsman can be propagated through seeds, division. Similar propagation techniques also apply to threadleaf false dandelion plant care, which shares the same genus.

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

Old Plainsman is susceptible to aphids, spider mites, whiteflies. 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.

Old Plainsman grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. In cooler regions, grow Old Plainsman as a houseplant or bring it indoors before the first frost.