DYI Covered Green House. The Swing N Cocoa blog has shared a step-by-step photo tutorial on how to build a small greenhouse. It protects your plants and vegetables from wind and rain, while keeping wayward animals away from it. It can be done on a weekend, and you can plant a lot of things in it, from tomatoes and cantaloupes, to onions and squash. You can even put in an automatic watering system.