This is a coarse but bold perennial giant for the back of the border that has yellow, daisy-like flowers in summer. Cups form where the toothed leaves meet the thick stems; birds are said to drink from the water held in the cups. Tough prairie natives that will self-sow, these plants need lots of sun and lots of room—a single plant can reach 7 or 8 feet tall and 6 feet across.
CareProvide moist, moderately rich, well-drained, neutral to alkaline soil for best results, but plants are fairly adaptable.
PropagationSow ripe seeds. Divide in spring.
ProblemsDowny mildew, rust
Fine Gardening Recommended Products
RAINPOINT Sprinkler Timer with Brass Swivel
Gilmore Rubber Hose Washer 10pk
Hunter Industries MP-1000-90 Hunter Nozzle
- Genus : Silphium
- Plant Width : 3 to 6 feet
- Zones : 5, 6, 7, 8, 9
- Plant Height : 6 to 10 feet
- Bloom Time : Early Fall, Late Summer, Summer
- Growth Rate : Fast
- Light : Full Sun to Partial Shade
- Moisture : Medium to Wet
- Maintenance : Moderate
- Plant Type : Perennials
- Characteristics : Self Seeds
- Plant Seasonal Interest : Summer Interest
- Flower Color : Yellow
Plant Characteristics are only available to Fine Gardening members
Sign up for a free trial and get instant access to our complete plant guide as well as our entire collection of articles and videos.
