Flowering plants will grow 2 to 3 times in size they are in veg. Plan for this. If you can, tie down the taller ones. Dont do it all in one shot. Bend the plant about 1/4 of the way down and tie it. Come back like an hour or so later and bend it 1/2 way and let it sit. Do this until you have bent it as far as you need. If you try to do it too quickly, your stem could break.