Delphinium (8)
I believe the answer is:
larkspur
'delphinium' is the definition.
(larkspur is a kind of delphinium)
This is all the clue.
(Other definitions for larkspur that I've seen before include "Blue flower" , "Cultivated plant of the genus Delphinium" , "Plant with flower spikes" , "Delphinium-like plant" , "it grows" .)