tip number 1, cannabis doesn't usually grow unless planted by someone, meaning that plant you found isn't yours to begin with and was more than likely planted there by someone who's going to come back looking for it..
tip 2, they're not going to be too happy when they find out that someone, ie, you, took the plant that they planted and are attempting to now grow it in your car.
tip number 3, look up one of our many sponsors and buy your own seeds, or buy a bag of bud and find a seed in it and attempt to start a grow that way..
sorry to be so mean, but we don't take too kindly to people who "find" marijuana plants around these parts..