| Description | Holy Grail Cup Plant (Silphium perfoliatum) A cultivar of the native Cup Plant with foliage that emerges chartreuse and brightens as the summer progresses. A large perennial with yellow flowers. |
|---|---|
| Pronunciation | (SIL-phee-um) |
| Plant Type | Perennials Hardy |
| Hardiness Zone | (4)5 |
| Sunlight | full |
| Moisture | average, prefers moist |
| Soil & Site | average, prefers moist |
| Flowers | yellow daisy-like flowers, found on tall single scapes (flower stalks) |
| Fruit | achene |
| Leaves | chartreuse, opposite leaves, coarsely toothed, form a water reservoir where they join at the stem |
| Dimensions | 6 by 2 feet (HS) |
| Native Site | Species plant native to North American Prairies |
| Cultivar Origin | Brent Horvath, Intrinsic Perennial Gardens, Illinois USA |
| Author's Notes | I have seen many Cup Plants and have a couple growing in my garden and they are green. So when I came up to this one and it had yellowish foliage, my immediate thought was chlorosis. But to my delight it was a cultivate version with an interesting chartreuse color. |
| Notes & Reference | Intrinsic Perennial Gardens (www.intrinsicperennialgardens.com) |
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