The Persian Lime fruit is about 6 cm in diameter, often with slightly nippled ends, and is usually sold quite green, although it yellows as it reaches full ripeness. The persian lime is larger, thicker-skinned, and less aromatic than the key lime, which has a wider agricultural distribution worldwide. The advantages of the Persian lime in commercial agriculture compared to the Key lime are the larger size, absence of seeds, hardiness, absence of thorns on the bushes, and longer fruit shelf life. The Persian Limes are less acidic than key limes and don't have the bitterness that lends to the key lime's unique flavor. The Persian Lime is known as the "Grocery Store Lime" because this is the lime that you typically find in your grocery store produce department.  Why buy them at the grocery store, when you can have your own beautiful fragrant tree filled with your own Persian limes?