Nursery supply (5)
I believe the answer is:
mulch
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nursery supply</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for mulch that I've seen before include "It holds moisture and checks weeds" , "It's laid around plants to retain moisture and keep down weeds" , "Requisite for garden" , "Ground cover" , "Garden additive" .)