This genus has only recently started to become available out of Asia, and offers some excellent species for the terrarium. This one has reached 6″ or so for me, It’s possible it could reach a larger size with time, and based on its growth habit I think it stays very small. Plants flower readily when they have 4-6 leaves. The plant below is a bit nutrient deficient, which is why the leaves are so yellow.
The blooms are long lived, at least a month, but maybe longer. The spike is tall compared to the size of the plant, about 8″.