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The Dahlia Society has classifications based on bloom size. An imperial tree dahlia is in the BB class.
AA is 10 inches.
A is 8-10inches.
B is 6-8 inches.
BB is 4-6 inches
M is up to 4 inches
BA is over 3.5 inches
MB is over 2 inches but less than 3.5 inches
P is up to 2 inches.

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Q: What class is the imperial tree dahlia in?
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