How does elevation affect which horticultural crops can grow in tropical regions?

Elevation is a critical factor in determining which horticultural crops can thrive in tropical regions because it directly influences local temperatures. In the wet tropics, temperatures typically decrease by approximately 0.5 °C (0.9 °F) for every 100 meters (328 feet) of elevation gained.1

This temperature gradient allows for the cultivation of plants that would otherwise struggle or fail in the hot, low-elevation areas of the tropics. By moving to higher slopes, growers can create conditions suitable for many subtropical and even temperate plants. For instance, the scarlet runner bean, a temperate-region plant, can successfully grow, flower, and develop pods on high-elevation slopes near the Equator, whereas it fails to set pods in low-elevation, subtropical environments.2

Beyond temperature, elevation also influences other environmental variables, such as soil depth and organic content, which further affect plant growth and forest composition. Consequently, elevation acts as a key determinant that expands the range of horticultural possibilities within tropical latitudes.12