Mt Cuba Center
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Trial Garden

Coreopsis delphiniifolia

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Coreopsis delphiniifolia proved to be relatively hardy over the three year evaluation, losing only one plant over the course of two winters. This species is incredibly floriferous as well as disease resistant. Its only negative characteristic is a very floppy habit. We found moderate success with cutting plants back at the first signs of flopping in July. However, perhaps a better approach would be a preventative cut (by half) in June. This will delay flowering for about four weeks, but the plants will have a much tidier appearance through the rest of the year. Although a bit too large and rangy for the front yard, Coreopsis delphiniifolia is a great plant for massing large blocks of color that last all summer.


  • Rating
  • Common Name
    lark-spur tickseed  
  • Bloom Period
    July – September 
  • Flower Size
    2” diameter 
  • Size
    28” x 36” (h x w) flopping to 70” wide 
  • Weeks in Bloom
  • Disease Resistance
    Disease free