STEP 1: I filled the bottom of the 32-ounce mason jars with smooth river rocks. I wasn't sure if I was going to run out of stones, so I basically just put enough that they whole bottom of the jar was covered. In retrospect, I wish that I had put a thicker layer of stones so that they would show more, but I am still happy with the result.
STEP 2: I put in about 1/3 cup of horticultural charcoal. This helps with drainage and also helps remove yucky gases from the jars.
STEP 3: Added a good layer of potting soil. I made sure not to get any kind that had fertilizers in it, because I read that moss likes very simple dirt to grow in. I measured out about 3/4 cup of dirt.
STEP 4: Added the moss. I bought these adorable little dots of moss from silknparachute on Etsy and they were absolutely perfect for this job. They were mostly small enough to fit through the jar openings and the ones that weren't broke apart gently.
STEP 5: Miniature animals! Of course I had to use animals of the Northeast so they would fit with our wedding theme! The terrarium that will be featured on our sweetheart table has two special animals in it just for us.
STEP 6: Using twine, I added tags with care instructions so our guests will be able to take the terrariums home and keep them thriving!