Prize in college for flowers (8)

'flowers' is the definition.
The answer and definition can be both plants as well as being plural nouns.
Maybe they are linked in a way 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 into 'kings' is 'KINGCUPS'.

'for' is the link.

Can you help me to learn more?