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Silphium perfoliatum

More About Silphium perfoliatum

  • Bright yellow, daisy-like flowers
  • Coarsely-toothed, bristly, oval, green leaves are 20 cm long
  • Leaves are opposite each other and join together at stem to cup water
  • Sturdy, central stem is hairless and square
  • Upright, clumping habit
  • Bloom Time: June to August
  • Flower Size: 10 cm

Interesting Notes:

Native to Ontario

Zone:

4

Height:

150-250 cm

Spread:

75-90 cm

Colour:

Yellow

Cup Plant Growing and Maintenance Tips

Easily grown in an average garden soil, it is able to withstand heavier, wetter conditions under certain conditions and may drop some of its lower leaves with continued drought. 

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Silphium perfoliatum Characteristics

Full Sun
Full Sun
Partial Sun/Shade
Partial Sun/Shade
Fast
Fast
Native to Ontario
Native to Ontario
Drought Tolerant
Drought Tolerant
Bog or water garden
Bog or water garden

Soil Moisture

Moist to Average

Flowering Time

Summer

Habit

Upright
Clumping

Foliage Color

Green

Landscape uses

Roadside planting
Naturalizing
Woodland/woods edge