Make Your Own Grow Box Or Grow Chamber For Cheap! In this video, I show you how I build my own grow cabinet for starting seedlings or growing tropical plants or starting off your clones and other delicate plants that need a head start! These boxes can be as elaborate or as simple as you want. The key is to get the heating and lighting requirements down for the plants that you wish to grow. Build as big as you can, because trust me, you'll fill up the space quickly. Especially after you see how the plants respond and grow in optimal heat and light!