Screwbean mesquite Plant Care

Screwbean mesquite (Prosopis pubescens) belongs to the Fabaceae family within the Prosopis genus. Screwbean mesquite is native to the southwestern United States and northern Mexico. Screwbean mesquite is also known as Screw bean.

Screwbean mesquite displays a large spreading tree growth habit, reaching up to 30 ft tall with a spread of approximately 40 ft. Screwbean mesquite produces small yellow-green flowers in elongated clusters.

Leaf size: approximately 6 inches.

Water a young or newly planted Screwbean mesquite every 14–21 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established trees mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

Screwbean mesquite thrives in full sun.

Prosopis pubescens tolerates temperatures of 50–95°F. Screwbean mesquite prefers humidity levels of 10–60%.

Well-draining sandy soil mix with good aeration. Good drainage is essential for Screwbean mesquite to prevent waterlogging, which leads to root rot and fungal issues.

Feed Screwbean mesquite every 8 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established trees 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 soil mix with good aeration. Avoid low spots where water collects after rain.

Screwbean mesquite is suited to USDA Zone 12a.

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

Screwbean mesquite can spread to about 40 ft (12.2 m) and reach about 30 ft (9 m) tall. Space plants about 40 ft (12.2 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 tree spacing calculator.

Prune Screwbean mesquite 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 tree in one year.

Screwbean mesquite 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.

Screwbean mesquite can be propagated through seeds, cuttings. Similar propagation techniques also apply to chilean mesquite plant care, which shares the same genus.

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Screwbean mesquite is susceptible to aphids, spider mites, pod gall midges. 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.

Screwbean mesquite grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Screwbean mesquite is native to the southwestern United States and northern Mexico. In cooler regions, grow Screwbean mesquite as a houseplant or bring it indoors before the first frost.