Cup Plant Plant Care

Cup Plant (Silphium perfoliatum) belongs to the Asteraceae family within the Silphium genus. Cup Plant is native to eastern and central North America. Cup Plant is also known as Indian Biscuit Plant, Rosinweed, Resinocaulon perfoliatum.

Cup Plant displays a tall, upright perennial growth habit, reaching up to 6 inches tall with a spread of approximately 3 inches. Cup Plant produces large yellow composite flowers in late summer.

Leaf size: approximately 8 inches.

Silphium perfoliatum requires watering every 7–14 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.

Cup Plant thrives in full sun light conditions. The optimal light range is 2000–4000 lux. Avoid placing Cup Plant in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Silphium perfoliatum grows best at temperatures between 60°F and 80°F. Cup Plant prefers humidity levels of 40–70%.

Well-draining loamy soil with added compost for nutrients. Good drainage is essential for Cup Plant to prevent waterlogging, which leads to root rot and fungal issues.

Repot every 3-4 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.

Cup Plant can be propagated through seeds, division of rhizomes. Similar propagation techniques also apply to compass plant plant care, which shares the same genus.

Cup Plant is susceptible to aphids, caterpillars, spider mites. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Cup Plant grows outdoors in USDA Zone 13a. Native to eastern and central North America, Cup Plant is adapted to warm climates. In cooler regions, grow Cup Plant as a houseplant or bring it indoors before the first frost.