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
Returns of standard seed mixes and individual species must be made in the original unopened packaging within 10 days of delivery. If you wish to return live plants, you must do so within 5 days of delivery. Returns of standard mixes, individual species, and live plants are subject to a restocking fee of 25%. Custom seed mixes may not be returned. When returning non-damaged goods, the buyer is responsible for shipping charges, and return shipping may be made by whatever means the buyer selects.
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