No, Fertilome Rooting Powder is only labeled for use on ornamentals and/or house plants.
No, the Fertilome Rooting Powder is not for use in a vase of water, rather in a planting medium such as soil in a container or in the ground. You should select the desired cuttings from your plants, moisten the cuttings, and dip the cutting into the powder. Dip it until the stem is covered up to the point that it will be placed into the soil. Remove any excess powder on the cutting by tapping the plant on the edge of the product container, letting the extra powder fall back into the container. Place the cutting into the desired rooting medium, making sure that the powder isn't rubbed off when inserting. Keep the medium moist until the roots of the cutting have started growing.
The Ferti-Lome Rooting Powder is not for use in water. Rather, cuttings should be dipped into the powder and then planted in any medium/soil to help encourage new root growth. You can view the full product label here.