disbud
verb
dis·bud (ˌ)dis-ˈbəd 
disbudded; disbudding; disbuds
transitive verb
1
: to thin out flower buds in order to improve the quality of bloom of
2
: to dehorn (cattle) by destroying the undeveloped horn bud
Example Sentences
Recent Examples on the Web August is a busy time in the garden with tying, disbudding, deadheading, collecting seed and other dahlia chores, but Portland experts believe the best blooms occur from about mid August to mid September. 
Janet Eastman, OregonLive.com, 14 Aug. 2017
Janet Eastman, OregonLive.com, 14 Aug. 2017 Word History
First Known Use
1727, in the meaning defined at sense 1