Cup Plant (Silphium perfoliatum)
PriceFrom $4.50
Excluding Sales Tax
Cup Plant is a 4' to 8' tall native perennial that has large, opposite, coarse toothed leaves all the way up the stalk. The opposite leaves are united around the stem to form a cup that actually holds water. The terminal flower heads have large 3" wide light yellow rays and darker disk flowers in the center. This plant is easily grown in rich, medium to wet soils, full sun or part shade, and will tolerate some drought after establishment. Cup Plant is an effective backdrop plant in a perennial garden and is used in moist wildflower gardens and meadows and in moist open woodland sites. It produces a gummy sap when broken like the other Silphium species. Prices listed are based on pure live seed weight, not bulk weight.
Species Details
| Common Name (Botanical Name) | Cup Plant (Silphium perfoliatum) |
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| Bloom Season | Summer-Fall |
| Group | Wildflowers/Forbs |
| Bloom Color | Yellow |
| Duration | Perennial |
| Soil moisture | Dry (Xeric);Medium (Mesic);Wet (Hydric) |
| Soil texture | Coarse (Sand) |
| Sun Exposure | Full Sun;Part Shade |
| Status | Native |
| Wetland status | FAC;FACW |
| pH | Acidic;Neutral |
| pH Values | 4.5/7.5 |
| Average height | 6+ ft |
| USDA Zones | 3a;3b;4a;4b;5a;5b;6a;6b;7a;7b;8a;8b;9a;9b; |
| RNS Region | 1;2 |
| Planting rate/Acre | Not Recommended |
| Seeds Per Lb. | 22400 |
| Seeds Per Oz | 1400 |
| Seeds Per Packet | 75 |
| Product Benefits | Aesthetic Value;Wildlife Cover;Wildlife Food;Nectar Source; |