Continued to cultivate? (8,2)

I believe the answer is:

ploughed on

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'continued' is the definition.
The definition and answer can be both to do with motion as well as being past participle verbs.
Perhaps there's a link between them I don't understand?

'cultivate?' is the wordplay.
I cannot really understand how this works, but
'cultivate?' could be 'plough' (I've seen this before) and 'plough' is present in the answer.
This explanation may well be incorrect...

'to' acts as a link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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