Prize in college for flowers (8)

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

'prize in college' is the wordplay.
'prize' becomes 'cup' (cup is a kind of prize).
'in' means one lot of letters goes inside another.
'college' becomes 'Kings' (King's College London).
'cup' inserted inside 'kings' is 'KINGCUPS'.

'for' acts as a link.

Can you help me to learn more?