How cute is this blown glass hedgehog water globe! This wonderful self-watering tube is perfect for every plant -- and hedgie -- lover. Cares for your plants and adds a little pep. Featuring two adorable dark eyes and nose, the clear glass will let you see when the water gets low. Blown-glass. 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.