...Winter
the most plants can grow it summer season
This depends on the type and season. Most are OK from sed.
Most plants will grow better in potting soil because it contains nutrients the plants need to grow and is formulated so the water will drain slowly enough for the roots to take up the water, but not so slowly to cause the plant to rot. Roots can grow freely and anchor the plant easily.
Most Plants grow/get bigger
Yes it is. C3-type plants are cool-season plants, which grow best in the cool season in the South or in the colder climate of the North (Northern USA and most of Canada).
Since yellow is only weakly absorbed by the pigments, the plant will grow slowly if at all. Violet, blue and some red light is most strongly absorb.
Pakistan produces the most tasty mangoes in the world. The best season to plant mangoes in Pakistan is July or August. Because it is the rainy season and mango plants will grow speedily.
most plants grow in the a-horizon
The roots of most plants grow towards the pull of gravity.
seed
Leaves
UV light helps plants grow healthier and quicker. It is not required though for most plants to grow and survive.