Norfolk Island pine is a festive-holiday, easy to care for houseplant plant you can enjoy all year long! During the holidays, its needled branches look right at home decorated as a Christmas tree. A Norfolk Island Pine is also on NASA’s air-purifying list of houseplants that clean the air in your home. Although it’s called Norfolk Island pine, it actually isn’t a pine at all. This stately tree is a tropical plant native to the South Pacific. Indoors, it’s relatively slow-growing, but over several years, this plant can grow to 6 feet tall or more. If you want to encourage faster growth, move it outdoors to a shaded or partly shaded spot during the Summer. Wait until all dangers of frost have passed before moving it out and bring it back in before the first frost in Fall.