This moss has been used most commonly for orchids. It can also be mixed in with your soil to act as a conditioner. Also this moss is amazing for propagating your plants!
This dry Premium Natural Sphagnum Moss Mix is plenty for one of your potted plants. Sphagnum Moss can hold 20x its dry weight in water
 
Sphagnum Moss Care:
Sun is not required; 
Let the moss absorb water for 10 minutes;
Keeps in the moisture;
This moss is able to come back to life.
Used for:
Soil mix;
Propagating;
Epiphytic plants like Orchids;
Terrarium;
Much more.