Fern/fɜːrn/ Definition 1 of 1Pro Tip 1/3No Flowers Ferns will never bloom flowers, unlike many other plants. Don't wait for the fern to flower, it doesn't produce any. Pro Tip 2/3Indoor Plant Ferns are often kept indoors and can purify air, beneficial for homes and offices. My office desk has a small fern for cleaner air. Pro Tip 3/3Prehistoric Context Ferns have ancient origins and were present when dinosaurs roamed, adding historical intrigue. Ferns have been around since the time of the dinosaurs.