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All answers having "Spring bloom" as clue:

4 Character Answers:

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IRIS

LILY



5 Character Answers:

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LILAC

PEONY

TULIP



6 Character Answers:

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AZALEA

CROCUS



7 Character Answers:

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ANEMONE

JONQUIL



8 Character Answers:

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DAFFODIL

HYACINTH

SNOWDROP