A terrarium is by definition, is usually a sealed glass container containing soil and plants. They also need to be open-able so they can be maintained. However, we like to refer to terrariums as gardens in a jar. Down in London, we tend to lack garden space or share it with hundreds of others and call it a park. Terrariums give you the opportunity to create your own space, straight from your imagination. Bring your garden inside, by creating a green world inside a jar. Choose your plants, carefully arrange them and sit back and enjoy your terrarium from the comfort of your sofa.
How do they work?
Closed terrariums create a unique environment for plant growth, as the transparent walls allow for both heat and light to enter the terrarium. The sealed container combined with the heat entering the terrarium allows for the creation of a small scale water cycle. This happens because moisture from both the soil and plants evaporates in the elevated temperatures inside the terrarium. This water vapour then condenses on the walls of the container and eventually falls back to the plants and soil below. This contributes to creating an ideal environment for growing plants due to the constant supply of water, thereby preventing the plants from becoming over dry. In addition to this, the light that passes through the transparent material of the terrarium allows for the plants within to photosynthesize, a very important aspect of plant growth.
Are they self-sustainable?
In the large sense yes. They do require looking after like any plants do but terrariums can largely be left to their own devices. Every now and then you might find they aren't getting enough light, or too much, and will require shifting around the house to make sure they have the best environment. If a terrarium gets too much light, they will photosynthesize too much, leaving you with a soggy terrarium that could then be prone to mold.