German girl harvesting orchids at first takes advantage of nursery's facilities (11)

I believe the answer is:

glasshouses

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

'nursery's facilities' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps there's an association between them I don't understand?

'german girl harvesting orchids at first takes advantage' is the wordplay.
'german girl' becomes 'glass' (I can't justify this - if you can you should believe this answer much more).
'at first' suggests taking the first letters.
'takes advantage' becomes 'uses' (I've seen this in other clues).
The first letters of 'harvesting orchids' is 'ho'.
'glass'+'ho'+'uses'='GLASSHOUSES'

'of' acts as a link.

Can you help me to learn more?

(Another definition for glasshouses that I've seen is " Military detention centres".)

I've seen this clue in The Everyman puzzle in The Observer.

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