Aqua Globes - 2 Pack - Decorative Hand-blown Glass Plant Watering Bulbs 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. For use with potted plants, houseplants, patio plants, hanging plants and outdoor gardens.