- Self-Watering Science Simplified: These glass globes (21.8 x 6.8 cm) automatically regulate water flow through natural soil moisture levels. Simply fill and insert, and they gradually release water for 7-10 days, preventing both overwatering and drought stress in your plants. - Crystal Clear Laser-Colored Glass: Premium hand-blown glass with prismatic laser etching that creates rainbow reflections in sunlight. The transparent design lets you monitor water levels at a glance while adding stylish sparkle to your plant decor. - Vacation Plant Savior: The perfect solution for keeping plants hydrated during 1-2 week trips. Each set includes 2 watering bulbs to care for multiple plants. Works with most pot sizes (4-12 inch diameter) and plant types from herbs to flowering houseplants. - Eco-Friendly & Chemical-Free: Unlike plastic alternatives, these glass bulbs won't leach chemicals into soil. The narrow 6.8 cm base prevents mosquito breeding while allowing optimal oxygen flow to roots, healthier than traditional watering cans. Use scenarios: - Everyday care for busy households: Install the bulbs in potted herbs or houseplants to maintain balanced moisture for up to 7-10 days, reducing frequent watering and helping prevent overwatering. - Short trips and vacations: Take the guesswork out of plant care during 1-2 week trips by relying on the two bulbs to sustain multiple plants across pots. - Mixed plant collections: Suitable for a range of plant types from herbs to flowering houseplants, and compatible with pots from 4 to 12 inches in diameter, allowing you to manage several plants with a single set.