Garden plants in books (7)

I believe the answer is:

annuals

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

This clue might be a double definition.

'garden plants' is the first definition.
'annuals' can be an answer for 'plants' (annual is a kind of plant). I am not sure about the 'garden' bit.

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

'in' is the link.

Can you help me to learn more?

(Other definitions for annuals that I've seen before include "Yearly books" , "Yearbooks" , "Yearly plants" , "which one may enjoy in bed?" , "Books published once a year" .)

I've seen this clue in The Telegraph.

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