Annual. Warm Season. Once cured, hard-shelled gourds such as Birdhouse will last indefinitely and can be painted, carved, cut, or drilled as you would do with wood, for hundreds of craft projects. Birdhouse gourd makes a great birdhouse — leave natural color or paint any color you want. See inside of packet for birdhouse construction hints. 15' to 35' vines grow on the ground or up a very sturdy trellis.