Levelling soft border, broke up plant
I believe the answer is:
evening primrose
'broke up plant' is the definition.
'evening primrose' can be an answer for 'plant' (evening primrose is a kind of plant). I am not certain of the 'broke up' bit.
'levelling soft border' is the wordplay.
'levelling' becomes 'evening' ('even' can be a synonym of 'level').
'soft border' becomes 'primrose' (I am not sure about this - if you are sure you should believe this answer much more).
'evening'+'primrose'='EVENING-PRIMROSE'
Can you help me to learn more?
(Other definitions for evening primrose that I've seen before include "source of oil" , "Plant with pale yellow flowers" , "flowering plant" , "plant that flowers at night" , "flower" .)