I cant get rid of this plant, and i dont know what it is?

I have a planter in my front yard where i planted some bushes. Before i could plant anything i had to get rid of these weeds or whatever they are. They are back and they are growing like crazy i need to get rid of them. They start with real tight stalk that splits off into seaweed shaped leaves and end up in a pealed banana shape... They are growing so fast they are destroying my planter