Step 1: History
But not only plants that like water can be held in such containers. It depends on amout of water: a little of it and you can keep cacti inside. Some more and you can keep some flowers. Even mor and you can plant mangos, lemons and other exotic plants inside.
Step 2: Making it
You can put seedlings or seeds inside. And you don't have to put only one plant inside. You can make a little bottle-garden but remember - the plants you put inside together must need about the same amounts of water and light.
Step 3: Extra
The walls are not so clean because seeds need only water and heat to sprout. And water drops forming make dhem dirty again. So I will clean when they start sprouting - then they will need light as well.
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