This almost thornless cultivar is known for producing juicy, highly-sour fruit with very few seeds and a smooth, medium-thin rind. As a true lemon, it has a more sour taste than hybrid lemons. Once established, it will fruit all year round, with the biggest crops occurring in the spring and summer seasons. Citrus lemon ‘Eureka’ has scented white flowers that bloom throughout the year, and it is self-fertile. However, Citrus lemon ‘Eureka’ is less cold-tolerant than other lemon cultivars, so it is best suited for warmer and/or coastal areas where frost damage is less likely to occur. Citrus lemon is evergreen and native to Asia, primarily Northeast India (Assam), Northern Myanmar, and China. Learn more about Citrus lemon. Citrus lemon ‘Eureka’ originated in Los Angeles, California, United States in the late 1800s, possibly having its ancestry from Citrus lemon ‘Lunario’ from Italy. Citrus lemon ‘Eureka’ was selected in about 1877 from seedlings that were planted in 1858. C. R. Workman provided Thomas A. Garey with budwood from one of these seedlings and he propagated the first Citrus lemon ‘Eureka’.