Bloom sprang up (4)
I believe the answer is:
rose
I believe this clue is a double definition.
'bloom' is the first definition.
(bloom can mean a flower)
'sprang up' is the second definition.
(I've seen this before)
(Other definitions for rose that I've seen before include "Stood" , "Prickly bush" , "increased in price" , "sprang up" , "Perforated cap; reddish colour" .)