Lime (Citrus × aurantiifolia) is a citrus hybrid of Citrus micrantha and Citrus medica. The fruit is spherical, 1-2 inches in diameter, and green when unripe but turns yellow when ripe. The tree can grow up to 6-15 feet in height and 2-4 feet in spread. It requires full sun exposure and well-drained soils with a pH range of 5.5 to 6.5. The tree is sensitive to cold temperatures and thrives in warm, moist climates.
Here are some step-by-step instructions for caring for your Citrus × aurantiifolia tree: Create the ideal environment: Key lime trees thrive in warm, sunny climates. They require full sun exposure and well-drained soils with a pH range of 5.5 to 6.5. The tree is sensitive to cold temperatures and thrives in warm, moist climates. Plant the tree: Plant your key lime tree in a location that receives at least 8 hours of sunlight daily year-round and that never drops below 41 to 44 °F (5 to 7 °C). If you live in a colder climate, grow your key lime tree indoors during the colder months. Once temperatures begin dropping and frost starts appearing on the ground, bring your key lime tree indoors to a sunroom, a patio, a greenhouse, or some other room that will still allow it to receive abundant sunlight. Fertilize and water the tree: Key lime trees require regular watering and fertilization. Water your tree thoroughly once per week, allowing soil to partially drain in between. Use a citrus fertilizer to help the tree produce more fruit. Harvest and prune: Once your tree is 2 to 3 years old, you should be able to harvest anywhere from 10 to 30 limes every year! Pick limes once they are firm and 1-2 inches (2.5-5 cm) in size. Prune your key lime tree from time to time if you find it’s getting unruly or too large.