Which type of greenhouse structure is characterized as the simplest and is commonly used by individuals rather than commercial growers?

The simplest type of greenhouse structure that is commonly used by individuals, rather than commercial growers, is indeed the A-Frame Greenhouse. This design features a straightforward, triangular shape, making it relatively easy to construct and manage.

The A-Frame Greenhouse typically requires less material and effort to build compared to more complex structures, making it accessible for hobbyists and gardeners who may not have extensive construction experience. Its design also allows for good light penetration and can promote air circulation, which are both beneficial for plant growth.

In contrast, while Quonset and Hoop Houses are also simple structures, they tend to be larger and may not be as intuitive for individual, casual use. Gutter Connected Greenhouses are more complex, typically designed for commercial operations where multiple greenhouses are connected for efficiency, making them less suitable for individual gardeners. The A-Frame's simplicity and ease of construction are key reasons it is favored among non-commercial growers.