I love plants! Unfortunately I am not very consistent at caring for them plus I never know what to do when going on holiday so after the years my plant collection consists of some very persevering specimen.
Succulents are perfect as they seem to be happy under every kind of condition, putting them in a jar makes it even easier, as you build a little eco system. Under the right conditions it can stay like this for years.
All you need is a jar (every kind or size will do, mine has a sealed lid although that is not necessary), some pebbles or glass pearls for the bottom, some dirt and something to keep the soil from falling through the pebbles (I used some small fir branches this time, but I have used tissue paper or cut nylon tights before).
For the plant you can use any kind of succulent, but moss or grass is likely to do well, too, plus you can find some moss almost everwhere. In this case I have used a lttile succulent that I bought for about 2£.
The pebbles on the bottom of the glass prevent the plant from getting too much water. Add some fir branches, some dirt and your plant. You have to add a little bit of water to the terrarium (I soaked the roots in water before planting it), close the lid and place it near a window so it will get enough light. If you can see little drops of dew on the glass in the morning it has the right amount of moisture, otherwise you can adjust by taking of the lid for a few hours or add a few more drops of water.