"Luckily, my replacement blooms grew in beautifully. In fact, I was inspired to ___ by planting an extra row!" (4,3,4)
I believe the answer is:
gild the lily
(Other definitions for gild the lily that I've seen before include "Attempt to beautify that which is already beautiful" , "put too much make-up on?" , "Adorn unnecessarily something already beautiful" , "Over-adorn" , "Enhance what is already excellent" .)