Plant Food Crossword Clue — 5 Letters

One confident answer with explanation of the wordplay

BRINE
Uncertain
B
R
I
N
E

The question mark in "Plant food?" signals wordplay. "Plant" can mean a factory/industrial facility, and "food" for a plant (factory) could be raw material. However, thinking more carefully: "plant" as in a spy/mole, and "food" could be "feed." Alternatively, "plant food" could clue MULCH or GUANO (fertilizer). GUANO is 5 letters and is literally plant food/fertilizer.

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Other possible answers
GUANOGuano is a well-known fertilizer/plant food, exactly 5 letters.
MULCHMulch is used as plant food/soil amendment, 5 letters.
STEMSWith the question mark suggesting wordplay: food that comes FROM a plant (stems, seeds, etc.).
SEEDSSeeds are produced by plants and can be food, 5 letters.

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