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All answers having "Bloom" as clue:

3 Character Answers:

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PIP



4 Character Answers:

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IRIS

POSY



5 Character Answers:

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ASTER



6 Character Answers:

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FLORET

FLOWER



7 Character Answers:

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BLOSSOM

OPENOUT

TEAROSE



10 Character Answers:

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EFFLORESCE



11 Character Answers:

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FLORESCENCE