Shade (shadow)

It may refer to blocking of sunlight by a roof, a tree, an umbrella, a window shade or blind, wall, curtains, or other objects.

In temperate and tropical zones (most places on Earth), shade is an important issue in providing cooling and shelter from harmful heat and ultraviolet emitted by the Sun.

In gardening terms, there are various types of shade: Under a dense forest canopy, light intensity can be very low.

Special adaptations produce the shade tolerance that allows plants to survive in the understory.

In addition, shade within a canopy can elicit shade avoidance responses whereby plants elongate their shoots in order to reach light for optimal photosynthesis.