shouldn't matter one way or the other is fine as long as they're dry.in the jar not in the plastic baggies they came in right
actually it's drier in a fridge as the humidity is extracted by the freezer unit. 6 months is just a nap for weed seeds they can live for years in the fridge.its more humid in the fridge. i would use the rice if your were going to put them in the fridge. i may be wrong..