Whitney's Locoweed Plant Care

Whitney's Locoweed (Astragalus whitneyi) belongs to the Fabaceae family within the Astragalus genus. Whitney's Locoweed is native to the Cascade Range and the Sierra Nevada (U. Whitney's Locoweed is also known as Whitney's Milk-vetch, Astragalus hookerianus var. pinosus, Astragalus hookerianus var. whitneyi.

Whitney's Locoweed displays a low spreading ground cover growth habit, reaching up to 0.5 ft tall with a spread of approximately 2 ft. Whitney's Locoweed produces small pea-like flowers in shades of purple, pink, or white.

Leaf size: approximately 1 inches.

Water a young or newly planted Whitney's Locoweed 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.

Whitney's Locoweed thrives in full sun to partial shade.

Astragalus whitneyi tolerates temperatures of 60–80°F. Whitney's Locoweed prefers humidity levels of 40–60%.

Well-draining sandy soil mix with added perlite for extra drainage. Good drainage is essential for Whitney's Locoweed to prevent waterlogging, which leads to root rot and fungal issues.

Feed Whitney's Locoweed every 8 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 perlite for extra drainage. Avoid low spots where water collects after rain.

Whitney's Locoweed is suited to USDA Zone 5a – 8b.

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.

Whitney's Locoweed can spread to about 2 ft (0.6 m) and reach about 1 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 Whitney's Locoweed 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.

Whitney's Locoweed is hardy down to USDA zone 5a, so once established it can stay outdoors through winter in that zone and warmer ones.

Water deeply in late autumn before the ground freezes, and spread a 5–8 cm (2–3 in) layer of mulch over the root zone, keeping it away from the trunk.

Young and container-grown shrubs need extra protection: roots in a pot freeze much more easily than roots in the ground.

Whitney's Locoweed can be propagated through seeds, division of root ball. Similar propagation techniques also apply to aragallus acutirostris plant care, which shares the same genus.

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

Whitney's Locoweed is susceptible to aphids, spider mites, leafhoppers. 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.

Whitney's Locoweed grows outdoors in USDA Zone 5a – 8b. It survives winters down to planting zone 5a. Whitney's Locoweed is native to the Cascade Range and the Sierra Nevada (U.