Shade-tolerant tree species (shade trees): Tree species that have high shade tolerance and cannot tolerate excessive light (especially in arid environment). Such as spruce, torreya grandis, boxwood, pittosporum, ivy, etc.
The different needs of trees for sunlight are related to the climate, topography and ecological conditions of their producing areas. To find out the requirements of a tree species for sunlight, we mainly rely on the data and experience accumulated in daily work. In addition, we can learn something from the shape of the tree, which can be used as a reference for garden making. For example, among broad-leaved trees, deciduous trees are generally more active, and evergreen trees are more active; Among conifer species, needle-like leaves are mostly positive, flat or scaly leaves are mostly negative, and umbrella-shaped leaves are mostly positive and cone-shaped ones are mostly negative from the crown; The lower branches are mostly positive when they fall early, negative when they are lush, light leaves, thin leaves and thin curtains, and negative when they are dark, thick leaves and dense curtains. This morphological speculation is certainly not reliable, but it still has certain reference value, especially for beginners who don't know much about tree habits.