Vernal Jewelflower Plant Care

Vernal Jewelflower (Streptanthus vernalis) belongs to the Brassicaceae family within the Streptanthus genus. Vernal Jewelflower is native to Lake County, California.

Vernal Jewelflower displays an upright, branching growth habit, reaching up to 1.5 ft tall with a spread of approximately 1 ft. Vernal Jewelflower produces small, tubular flowers in shades of purple, pink, or white.

Leaf size: approximately 3 inches.

Water a young or newly planted Vernal Jewelflower 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.

Vernal Jewelflower thrives in full sun to partial shade.

Streptanthus vernalis tolerates temperatures of 50–80°F. Vernal Jewelflower prefers humidity levels of 40–60%.

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

Feed Vernal Jewelflower 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 loam with added organic matter. Avoid low spots where water collects after rain.

Vernal Jewelflower 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.

Vernal Jewelflower can spread to about 1 ft (0.3 m) and reach about 2 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 Vernal Jewelflower 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.

Vernal Jewelflower 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.

Vernal Jewelflower can be propagated through seeds. Similar propagation techniques also apply to streptanthus anceps plant care, which shares the same genus.

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Vernal Jewelflower is susceptible to aphids, cabbage worms, flea beetles. 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.

Vernal Jewelflower grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Vernal Jewelflower is native to Lake County, California. In cooler regions, grow Vernal Jewelflower as a houseplant or bring it indoors before the first frost.