Locating the Greenhouse

Choosing a greenhouse site is one of the most important steps to ensure a successful and productive growing season. Before you start building, take time to observe your property throughout the day—and throughout the year. The position of the sun changes drastically from summer to winter, and the shadows cast by buildings, fences, trees, or other structures can dramatically impact the amount of light your greenhouse receives, especially when you need it most.

Ideally, select a greenhouse site that receives at least six hours of direct sunlight per day during the winter. This is crucial because daylight hours are shorter, and the sun sits lower in the sky, reducing overall light intensity. Insufficient winter sunlight can limit plant growth, reduce yields, and increase heating needs. To get the clearest picture of your sunlight exposure, map out the shadows during both summer and winter—or use a sun calculator app to estimate solar access year-round.

Avoid placing your greenhouse in areas that are shaded during the colder months, such as the north side of your home or beneath tall evergreen trees that block light even when leafless deciduous trees would not. You’ll also want to steer clear of low-lying, boggy spots that stay wet or have poor drainage. Greenhouses need a level, well-drained surface to prevent structural issues, mold, and root rot. Sites built on soft fill or unstable ground may shift over time and damage your structure.

A location that is protected from strong prevailing winds will help maintain internal temperatures and reduce heating costs. Positioning near your home, water source, and electrical outlet will also make it easier to maintain and enjoy your greenhouse. Long hoses, heavy watering cans, or running power cords across the yard can quickly become a hassle.

For the best sun exposure, orient your greenhouse so that the ridge (the peak of the roof) runs east to west. This orientation captures more winter sun throughout the day, warming the structure more evenly. However, if your southern view is blocked, orient the greenhouse to maximize morning light—an eastern or southeastern exposure is especially beneficial for warming up plants early in the day.

Smart siting at the start will pay off for years to come in healthier plants, lower energy bills, and greater gardening success.

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