Crossword Genius

Where the salad leaves for the astronauts were grown? (6,4)

Ross

I believe the answer is:

rocket site

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

'where the salad' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'leaves for the astronauts were grown?' is the wordplay.
I cannot really understand how this works, but
'leaves' could be 'rocket' (I've seen this before) and 'rocket' is found within the answer.
The remaining letters 'site' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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