(You can also take all the difficulty out of the process by getting a DIY Terrarium Kit from The Sill or Cute Farm on Amazon.)
In general, terrarium plants should be petite. You don’t want them to touch the sides of your container. They also need to tolerate humidity and low, indirect light. (You can also take all the difficulty out of the process by getting a DIY Terrarium Kit from The Sill or Cute Farm on Amazon.)