Clustered tarweed Plant Care

Clustered tarweed (Deinandra fasciculata) belongs to the Asteraceae family within the Deinandra genus. Clustered tarweed is native to western North America. Clustered tarweed is also known as Hartmannia fasciculata, Hartmannia glomerata, Hemizonia fasciculata.

Clustered tarweed displays a low spreading groundcover growth habit, reaching up to 0.5 ft tall with a spread of approximately 1.5 ft. Clustered tarweed produces small daisy-like flowers in various colors.

Leaf size: approximately 2 inches.

Water a young or newly planted Clustered tarweed 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.

Clustered tarweed thrives in full sun to partial shade.

Deinandra fasciculata tolerates temperatures of 50–80°F. Clustered tarweed prefers humidity levels of 40–70%.

Well-draining sandy soil mix with added organic matter. Good drainage is essential for Clustered tarweed to prevent waterlogging, which leads to root rot and fungal issues.

Feed Clustered tarweed 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 well-draining sandy soil mix with added organic matter. Avoid low spots where water collects after rain.

Clustered tarweed 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.

Clustered tarweed can spread to about 2 ft (0.5 m) and reach about 1 ft (0 m) tall. Space plants about 2 ft (0.5 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 Clustered tarweed 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.

Clustered tarweed 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.

Clustered tarweed can be propagated through seeds, division of root ball. Similar propagation techniques also apply to purple ageratum plant care, which shares the same genus.

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

Clustered tarweed is susceptible to aphids, whiteflies, spider mites. 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.

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