Outsidepride 400 Seeds Perennial Silphium Cup Plant Flower Seeds for PlantingOnline now

Silphium perfoliatum, or commonly known as Cup Plant, is a towering plant that is often found growing in tall grass prairies in the Midwestern United States. This perennial has a long tap root and many smaller rhizomes which help to spread the plants. When growing in the wild, Cup Plant can establish colonies due to its ability to spread.

This tall flower can reach 3 – 7 feet tall growing as a perennial in USDA zones 4 – 9.

The large leaves are formed opposite of each other and are connected at their base to form a sort of “cup”. Morning dew collects in the cups and birds and insects often use the source for drinking water. The showy blooms measure 3 – 4 inches across and attract bees and butterflies.

It is recommended to give Cup Plant seed a cold treatment to aid in the germination process. Either plant the seed directly outdoors in the late fall or moisten the seed in a paper towel, seal the seed and moist paper towel in a plastic bag and place it in the refrigerator for 60 days before planting outdoors in the spring after danger of frost has passed.

Sowing Rate: 1 ounce per 250 square feet. Press the seed into the soil and cover with ¼ inch of soil. With a temperature of 68F, germination is usually within 28 days. Grow Cup Plant in full sun and in loamy, moist soil. Space plants 15 – 18 inches apart.

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