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Cup Plant

Silphium perfoliatum

Cup Plant, stands out in the garden with its distinctive foliage and striking yellow flowers. The leaves of this plant form a cup shape around the square stems, creating natural reservoirs that catch and hold rainwater, providing hydration for birds and insects. From mid-summer to early fall, it produces clusters of large, daisy-like flowers on stems that can reach up to 8 feet tall. This vigorous grower is perfect for back borders, wildlife gardens, and naturalized areas, where its height and flowers make a dramatic impact.

Details

Height60” - 120”
Spread36"
Bloom SeasonJuly – September
Soil Types
clayClay
loamLoam
sandSand
Soil Moisture
mediumMedium
moistMoist
wetWet
Sun Exposure
partSunPart Sun
fullSunFull Sun

Range Map

Available
Not available

Ecological Benefits

Maintenance Tips

  • Deadhead spent blooms to encourage additional flowering and prevent excessive spread through seeding.
  • Divide in spring or autumn every few years to maintain vigor and control spread.
  • Provide support for tall stems in exposed areas to prevent them from falling over in strong winds.

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