Unwanted plants (5)
I believe the answer is:
weeds
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unwanted plants</span>' is the definition.<br/ ><span class="explanation-format__explanation">(weeds are plants you don't want to grow)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for weeds that I've seen before include "Wild plants; mourning garb" , "mourning clothes" , "Unwanted plants" , "Are they worn by widows in the garden?" , "Black garments once worn by widows" .)