not much at first, pot will withstand a few nights of about 27 degrees, usually no more than about 3 in a row, i have had many plants make it through one or two nights. the buds themselves will be mostly unaffected, first you will notice the leaves die, they will droop and get all slimey, then the skin of the plant will do much the same, the main buds themselves will survive fine, as long as you pick them right after you notice the leaves all dying or you know you had a bad frost(27 degrees or lower) potency will not be effected.