Vernonia polysphaera Plant Care

Vernonia polysphaera (Cabobanthus polysphaerus) belongs to the Asteraceae family within the Cabobanthus genus. Vernonia polysphaera is native to tropical Africa. Vernonia polysphaera is also known as Vernonia homblei.

Vernonia polysphaera displays a compact, clumping perennial growth habit, reaching up to 1.5 ft tall with a spread of approximately 1.5 ft. Vernonia polysphaera produces small daisy-like flowers in various colors.

Leaf size: approximately 4 inches.

Cabobanthus polysphaerus requires watering every 7–10 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.

Vernonia polysphaera thrives in full sun to partial shade.

Cabobanthus polysphaerus grows best at temperatures of 60–80°F. Vernonia polysphaera prefers humidity levels of 40–60%.

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

Feed Vernonia polysphaera every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.

Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.

The PlantoScan app can remind you when to water and when to fertilize each plant.

Repot every 2-3 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.

Vernonia polysphaera can be propagated through seeds, division of offsets. Similar propagation techniques also apply to crassula bullulata plant care, which shares the same genus.

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Vernonia polysphaera is susceptible to aphids, spider mites, whiteflies. 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.

Vernonia polysphaera grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Vernonia polysphaera is native to tropical Africa. In cooler regions, grow Vernonia polysphaera as a houseplant or bring it indoors before the first frost.