Hand Crafted - Water Bulbs for Plants. 2 Piece Set. The perfect alternative to daily watering - and watering plants while you're on vacation. These easy-to-use, beautiful hand-blown glass Aqua Globes water plants for up to 2 weeks with no refilling. Just fill the globes with water and insert them into the soil. As the soil becomes dry, it releases oxygen into the Aqua Globes, which then release the precise amount of water needed, every time. No spills, no clean-up. No over-or-under watering. 3 3/4" Diameter x 12" Height.