Rosin Plant

Rosin Plant (Silphium) - Stout N. American Sunflower-like perennials, of stately habit, and among those which suggested the idea of the "wild garden" to me. There they are at home among the most vigorous growers, as they thrive and flower freely on the worst clay soils. S. laciniatum is a vigorous perennial with a stout stem, often 8 feet in height, and fine yellow-colored flowers, on drooping heads, which have the peculiarity of facing the east. S. perfoliatum (Cup Plant) is 4 to 8 feet in height, and has broad yellow leaves 6 to 15 inches long and flower-heads about 2 inches across. S. terebinthinaceum (Prairie Dock) has stems 4 to 10 feet high, panicled at the summit, and bearing many small heads of light yellow flowers. A variety (pinnatifidum) has leaves deeply cut or pinnatifid. S. terebinthinaceum has a strong turpentine odour. Other species are S. trifoliatum, S. integrifolium, S. ternatum, and S. albiflorum, in which the flowers are creamy-white and nearly 4 inches across. If planted in numbers in bold masses, these plants produce a stately effect in the wild garden, especially in autumn, but to do well they need an open and sunny space.

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