For most of the crops sufficient sunshine is essential for their proper growth, development and maturity. It is in the presence of sunshine that the plants are able to prepare food for them through the process of photosynthesis.
Chlorophyll of the leaves is only possible in the sunshine. Through sunshine the plants get the required amount of heat so vital for their existence. Since sunshine and atmospheric temperatures are closely interrelated, in the absence of sunshine the leaves become yellowish in colour and the development of plants is obstructed.
There can be no doubt about the inevitability of sunshine for the flowering and fruit bearing of the plants. However, there are certain exceptions.
There are certain plants which thrive even in the absence of sunshine. But in the realm of agriculture such darkness loving plants have no place.