- 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.
Start Indoors: 6-8 weeks before planting out
Germination: 10-14 Days
Plant Outdoors: 3-5' Apart
Light: Sun/Partial Shade
Instructions - Sow seeds indoors just beneath surface of soil in pots or flats. Store flats or pots in refrigerator for 30 days to enhance germination. Keep moist. Plant seedlings outdoors after danger of frost has passed and soil is warm. Can also be direct-seeded after danger of frost has passed.