Kaffir lime trees (Citrus hystrix) are small evergreen fruiting trees that originate from Indonesia. Kaffir lime trees grow up to only 10 feet tall at most, making them popular potted citrus trees that can be grown indoors in any climate. Kaffir limes bloom year-round and produce fruits that are used in many different types of dishes. The fruit rinds in particular are used as flavoring in Thai cuisine, and the leaves are also used as ingredients in dishes like green curry. When grown indoors in containers, Kaffir lime trees are usually kept at 5 to 6 feet tall or smaller.
Keep your Kaffir lime tree in full to partial sunlight. Maintain normal to warm indoor air temperatures around the Kaffir lime, and bring the tree indoors when frosts or freezing temperatures threaten.
Water your Kaffir lime tree two to three times per week to keep the soil evenly and constantly moistened. Provide water to the potting soil until the water drains freely from the bottom of the pot.
Feed your Kaffir lime tree once each month with a balanced liquid fertilizer, such as a 10-10-10 or 15-15-15 NPK formula. Follow the dosage directions on the label.
Prune your Kaffir lime tree once each year in early spring, right after new growth begins. Prune away any weakened, damaged, dead or crowded stems. You can also trim the tree at this time to keep it the proper size for its container.