dude can u grow an apple tree from a leaf? NO why would weed be different. get some seeds and get started. yes i mean plant the seeds in the ground water them and a weed plant will grow. u will have morethan one branch. yeild or amount of weed all depends on the type u grow and how good u take care of it and the amount of light it gets. and im guessing u dont know this so i will tell you that the plant needs to grow for 3-4 months before you can get any weed off of it.