Well, I should be completely honest by saying that the terrarium was bought empty for a couple dollars at a favorite local thrift shop. Pictures of them on pinterest or plants displayed at fun stores like Anthopologie have peaked my interest in tiny little living plants.
Having no clue where to start, I took the glass container to a
greenhouse that sells an amazing selection of houseplants and asked the
master gardener there for ideas. She gave me the layered soil for free and I
only had to buy the little "plugs" for it.
It's a good thing my college roommate like houseplants.
If only I could get her to like cats...