Coffee (especially Coffea arabica) is a small tree or shrub that grows in the forest understory in its wild form, and traditionally was grown commercially under other trees that provided shade. Since the mid-1970s, new sun-tolerant trees and shrubs have been developed in response to fungal disease presence, especially coffee leaf rust (Hemileia vastatrix), and with the aim to yield higher production rates. As a result of modernization and a push for higher yielding crops, sun-tolerant coffee plants were created to produce larger yields through higher-density, open planting, but the cultivation practices used for them are considered unsustainable and often have a negative impact on the environment. This has resulted in a new trend in support of shade-grown coffee.
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