Water is required for plants and they get it by rain. They also get it from the water bodies like, river, lake and ponds. Many Plants thrive during rainy season by their nature. So, they are green pastel during rainy season. On seeing this, we think by mistake, that they thrive due to rain. Sometimes nutrients like nitrogen and prosperous which are in the air, may come through rain. Therefore in rainy season, many plants get more nutrients.