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Botanical book? (6)

Ross

I believe the answer is:

annual

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'botanical' is the first definition.
Both the answer and definition are adjectives. Maybe there's an association 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 "Reference book that's published every year" , "Happening once each year" , "Lasting for a year" , "Twelve-monthly" , "Yearly publication" .)

I've seen this clue in the Evening Standard.
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