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All answers having "Fragrant shrub" as clue:

3 Character Answers:

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RHO



5 Character Answers:

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LILAC



6 Character Answers:

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AZALEA

MYRTLE



8 Character Answers:

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LAVENDER

MAGNOLIA

OLEANDER

ROSEMARY

SENTIENT



10 Character Answers:

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HELIOTROPE



11 Character Answers:

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HONEYSUCKLE