Because the Earth revolves and thus every country takes its turn to be furthest away from the Sun, creating what we call- NIGHTTIME!
Because of its distance from the Sun, it has dim sunlight.
Dim
it has bright
bright
bright
Mercury's sunlight is very bright because it is closest to the sun.
Mercury gets very bright sunlight as it is much closer to the sun than we are.
Somewhere in the Mesopelagic Zone (200m to 1000m). Although enough sunlight makes it here for some animals it is too dim for photosynthesis. There is no sunlight beneath this zone.
day
The dim sunlight and the light showers. In spring in the UK it is not normally boiling or freezing.
sunlight is a primary source of nutrients for the plant to make its own food. As it catches more sunlight it is more able to make its food or what you call sugar or another end product, that's what we are using right now, sunlight. Without the sunlight the plant will have a slower growth.
NOTHING needs to be done about it. Plants who don't get enough sunlight turn out that way. W/o sunlight, no use in developing chlorophyll, and w/o chlorophyll no green color.