Decorative and easy-to-place flower waterers made of thin glass are perfect if you need to be away for a few days or have a plant that dries out easily. Start by watering the plant thoroughly so the soil is moist. Fill the glass bubble – or self-watering bulb as it’s also called – with water and poke the snout into the flower soil. The water will gradually seep out as needed without your having to keep an eye on it. The self-watering bulb can be used both outdoors and inside, but keep it away from direct sunlight as it can create a reflection leading to very warm temperatures.