Sociable German takes drugs - mushrooms? (8)

I believe the answer is:

funguses

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

'sociable german takes drugs' is the wordplay.
'sociable german' becomes 'fung' (I can't justify this - if you can you should believe this answer much more).
'takes drugs' becomes 'uses' (someone who takes drugs is a 'user').
'fung'+'uses'='FUNGUSES'

Can you help me to learn more?

I've seen this clue in The Independent.

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