That’s a hard question to answer since it depends on the light in the room. A Dracaena Janet Craig plants grow very slowly in u003ca href=u0022http://houseplant411.com/glossary/light-for-houseplants-lowu0022u003elow lightu003c/au003e, but grow much faster in u003ca href=u0022http://houseplant411.com/glossary/light-for-houseplants-highu0022u003ebright indirect lightu003c/au003e. Always allow some space between the ceiling and the plant for growth.