Key Lime (Citrus x aurantiifolia) is a classic tropical citrus tree best known for producing the small, intensely aromatic limes used in famous desserts like key lime pie. This evergreen shrub or small tree features glossy green leaves, fragrant white flowers, and juicy fruit that ripens from green to yellow. Key lime thrives in full sun and warm temperatures, making it ideal for patios, sunny gardens, or container growing in cooler climates. When grown in pots, it can be moved indoors during winter. Once established, the tree is drought tolerant and productive, rewarding gardeners with fresh citrus and tropical fragrance.