You are probably already familiar with how to go forward in time to get more bells. But you don't want to do it because you will get all these weeds and have to pull them yourself right. Because thats the only way you can get rid of them right? WRONG! You can go forward in time and get rid of all the weeds without pulling them youself.
Every Monday night a goast will have lost his lamp and need you to help him find it. Go to the South East corner of your land, you should here a voice talking to you. Follow his directions to where he is and then talk to him. Like I said befor he will ask you to find his lamp. Once you find his lamp go to the attic of you house and he will grant you a wish. You can choose from getting rid of all the weeds in your land, getting ris of all the roaches, or get a random item. Obviously you will choose get rid of all the weeds in my land and WAHBAM! No more weeds