Field Suncup Plant Care

Field Suncup (Camissonia campestris) belongs to the Onagraceae family within the Camissonia genus. Field Suncup is native to the Mojave Desert of the United States.

Field Suncup displays a low rosette, spreading growth habit, reaching up to 0.5 ft tall with a spread of approximately 1 ft. Field Suncup produces bright yellow cup-shaped flowers.

Leaf size: approximately 2 inches.

Water a young or newly planted Field Suncup every 7–14 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.

Field Suncup thrives in full sun.

Camissonia campestris tolerates temperatures of 50–85°F. Field Suncup prefers humidity levels of 30–60%.

Well-draining sandy soil with some organic matter. Good drainage is essential for Field Suncup to prevent waterlogging, which leads to root rot and fungal issues.

Feed Field Suncup 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 soil with some organic matter. Avoid low spots where water collects after rain.

Field Suncup 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.

Field Suncup can spread to about 1 ft (0.3 m) and reach about 1 ft (0 m) tall. Space plants about 1 ft (0.3 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 Field Suncup 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.

Field Suncup 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.

Field Suncup can be propagated through seeds. Similar propagation techniques also apply to baird's evening primrose plant care, which shares the same genus.

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Field Suncup is susceptible to aphids, 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.

Field Suncup grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Field Suncup is native to the Mojave Desert of the United States. In cooler regions, grow Field Suncup as a houseplant or bring it indoors before the first frost.