Citrus Key Lime (L)the Citrus Key Lime too, is a hybrid between two fruit trees. You see, this Key Lime is actually a Hystrix Citrus and a Medica Citrus. All we know is that Limo is always around for Friday drinks. Slamming tequilas is a big hobby of his. Don Julio por favor! In order for your Lime trees to flourish, put them in a bright spot that will provide a few hours of direct sunlight each day. They love high humidity and also need the night time temperature drops