How to win against Garen

I played so many champions against Garen. In early i destroy him and go 3/0 but wenn i leave lane he pushes my turret in 10 sek. and i need to play without Turret. So after that you cant win any more he will just poke you and regenerate his life and will kill you 10 times. SO CAN ANYBODY TELL ME: HOW CAN I BEAT HIM!
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