If there are vision plants in enemy territory, pop them so they can't use them

Doesn't really matter if you get value out of them or not, if the enemy can't use them, you essentially wasted one of their resources for only an auto attack worth of time.

Of course, the lines marking what is enemy territory changes depending on the state of the game as well as the enemy rotations. You'll have to take these in mind and make judgment calls for yourself.