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All answers having "Plants" as clue:

4 Character Answers:

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PEAS

POTS

SETS

SOWS



5 Character Answers:

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ALOES

CACTI

FLORA

IVIES

MILLS

PLEAT

REEDS

SEEDS



6 Character Answers:

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EMBEDS

FLORAE

IMBEDS

MOSSES

SHILLS

SHRUBS



8 Character Answers:

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SITUATES



9 Character Answers:

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FACTORIES

SHRUBBERY



15 Character Answers:

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INDUSTRIALAREAS