Lemon trees, scientifically known as Citrus limon, are small evergreen trees that can grow up to 20 feet tall. They thrive in warm climates and require well-drained soil and plenty of sunlight. The trees produce fragrant white flowers, which eventually develop into bright yellow lemons. These fruits are rich in vitamin C and are commonly used in cooking, beverages, and cleaning products. Lemon trees can be grown in gardens or pots, making them popular among home gardeners. They typically bear fruit within three to five years after planting.