Kinnow needs sunshine, but that doesn't mean you have to live in a sunny state to grow them. They are really easy to grow inside. Just keep the tree outside until the temperature drops below 50, and then place it near a sunny window indoors. As a bonus, you'll get to enjoy the fresh, summery fragrance of the winter harvest in your home. On average, fruit-bearing begins when the trees are between 3 and 6 years old; however, exact timing will depend on the type of citrus (lemons, oranges, grapefruit, etc.), the cultivar, your climate, the health of the plant, and its care, and other factors. Flowering is not seasonal but occurs during warm weather and regular rainfall. Flowers and fruits may coincide.