25 Easy Terrarium Plants for Open or Closed Glass - The Spruce
Artillery ferns are easy to grow, and they will best thrive with minimal care in a closed terrarium, as this plant loves moisture and humidity.
variegated heart-shaped leaves
Creeping fig ( Ficus primula), with its small, <anchor>variegated heart-shaped leaves</anchor>, makes a lovely addition to almost any terrarium. It is a perennial climbing vine, so you can train it to creep up structures, which could be interesting to try in a large terrarium. The creeping fig prefers a warm, moist environment and will grow well in a closed terrarium. You can easily propagate creeping figs by rooting branch cuttings in water. Keep in mind that creeping fig can be toxic to pets.