A bottle garden is a type of closed terrarium in which plants are grown.
They usually consist of a plastic or glass bottle with a narrow neck and a small opening.
[1] The oldest bottle garden in existence is alleged to have been planted in 1960, and to have remained sealed from 1972 until at least 2013.
[3] Being easy to create and maintain, bottle gardens are also used in schools as an economical way to study miniature eco-systems within the confines of a classroom.
[1] Aerobic organisms like shrimp, snails, or bacteria take this excess oxygen for their own respiration, and return carbon dioxide to the air.