How can I make 2d grass moving by itself and when the character passes through it?

Unity Engine
1

I have a sprite of long grass that I would like to make move by itself slowly as if wind was blowing it, and when the player passes through it, it moves harder, any ideas from where to start or how to make this happen?

Thank you for taking your time to read this!

2

make a trigger around the grass

make it play faster while the player exits the trigger

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