Decorative Hand-blown Plastic Small Plant Watering Bulbs (White) Self-watering system eliminates the need to worry about leaving your plants unattended. Beautiful, genuine hand-blown glass design. Easy to use. Simply fill the globe and insert it into soil. Watering lasts for two weeks, until refilled. New size for smaller plants. For use with potted plants, houseplants, patio plants, hanging plants and outdoor gardens.