A greenhouse (also called a glasshouse, or, if with sufficient heating, a hothouse) is a structure with walls and roof made chiefly of transparent material, such as glass, in which plants requiring regulated climatic conditions are grown. Many commercial glass greenhouses or hothouses are high-tech production facilities for vegetables, flowers, or fruits. The glass greenhouses are filled with equipment including screening installations, heating, cooling, lighting, and may be controlled by a computer to optimize conditions for plant growth.

The definition of a greenhouse garden seems to be a thing that takes tons of cash with a complex process to build.

However, you can probably create your own greenhouse easily following this book! You're going to discover a one-stop compendium of all greenhouse best practices, from choosing a greenhouse or constructing one yourself, to setting up lighting, heating, and irrigation systems, all without spending a ton of cash.