Thornless Mexican Key Lime TreeCitrus aurantifolia A painless lime for beverages and Key Lime Pie! This handsome, shrubby tree sports aromatic foliage and flowers with small, thin skinned, fragrant fruit and a traditional, sour lime flavor. This variety can bear its delicious crop year round. Key limes are not tolerant of frost and should be treated as a houseplant in a sunny window. Citrus trees will ship in September based on your location, weather permitting. Our citrus trees