Crossword Genius

Flower book (6)

Ross

I believe the answer is:

annual

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This could be a double definition.

'flower' is the first definition.
The definition and answer can be both plants as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'book' is the second definition.
(annual is a kind of book)

Can you help me to learn more?

(Other definitions for annual that I've seen before include "Occurring once every year" , "Plant that lives and dies within one year" , "Occurring yearly" , "Hardy it may be" , "Yearly publication" .)

I've seen this clue in The Globe and Mail and The Guardian.
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