The watering bulb is your friend when you're taking a trip and you don't want to ask your mom to water your plants.
Simply fill the bulb with water (not too full, though!) stick it in the soil and let it work its magic. Your tree will get a little bit of water every day, for up to a week.
The green-colored bulb is about 28 cm high and made out of durable borosilicate glass.