i have an umbrella plant that is medium size, but one of the stems is leaning very far to one side. i want to repot it, and straighten out the stem so that it is more upright. any help on what i can use to stake into the pot before i plant, something sturdy that wont bend or sway with the weight of the plant? also, once i get it uprighted, how long will it need to be tied off until it will stand upright on its own. its more or a growth towards light that caused this to bend over time.