This unique decorating idea displays 3 Air Plants Oxacana set in 3 Alphones Sea Urchins that are suspended by clear line. One Jellyfish measures 4 inches tall and 4 inches wide. The flying Jellyfish can be hung anywhere and are sure to be a conversation starter. Air Plants (Tillandsia) get their common name from the fact they don’t require soil. They are epiphytes, which attach to other plants or trees for support.