Silphium integrifolium - Rosinweed
Rosinweed (Silphium integrifolium) is a fast-maturing perennial and unbranched except near the top. Its central stem is stout with stiff short hairs, and is usually green but can turn red with bright sunlight. It has opposite, broadly ovate 5" leaves that are also coarsely textured with stiff hairs. A panicle of composite yellow flowers form at the top and resemble small 2" - 3" sunflowers. This is the smallest of all the Silphiums, and it gets its name from the fragrant rosin that it produces, which was chewed as gum by Native Americans.
Soil Moisture: Moderate, Dry
Sun Exposure: Full Sun
Height: 4' - 6'
Spread: 2' - 4'
Hardiness Zone: 4 - 8
Bloom Color: Yellow
Bloom Time: July, August, September
Attracts: Birds, Butterflies, Pollinators
Silphium is a genus of flowering plants that are native to North America, and is commonly referred to as rosinweeds. They are very tall perennials that can grow taller than 8 feet, and have yellow flowers that can resemble sunflowers. With rosinweeds, the flower's outer florets are fertile and the inner florets are sterile, but in sunflowers it is the opposite. Silphium is an ancient Greek word for a North African plant whose identity has been lost and was claimed to be extinct in Roman times, but its gum or juice was prized as a medicine and condiment.
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