- Perennial and hardy to zone 4
- Plants grow to 5-10 feet
- Bright yellow flowers
- Leaves form cups that hold rainwater for birds and insects
(Silphium perfoliatum) An excellent species to plant for birds and pollinators. Birds are quick to devour the seeds. Large leaves surround the square stems to form little cups that hold rainwater for birds and insects. Plants grow 5-10' tall on fertile medium soils. Perennial. Hardy to zone 4.