The Trickle Watering Tube is a glass self-watering tube to keep every plant perfectly hydrated in style. A blown glass hedgehog, circle, or bird sits atop the tube for both practicality and whimsical style. Self watering bulbs are globes of blown glass with long thin necks. The globe is filled with water and the neck is stuck into the soil, where it releases the water steadily to supply your plants.