Eureka lemons originated in California from seeds that came from Sicily in the late 1850s. They are classified as true lemons, along with Lisbons, in that they are not crossed with any other citrus varieties. Eureka produces year-round and abundantly, with the most fruit production occurring during the spring to summer months. This is the pink-fleshed version of the common supermarket lemon.
Eureka lemon trees grow to between 10 and 20 feet tall, with a spreading and open growth habit. They are almost thornless with sparse foliage, which makes the fruit more prone to wind and sun damage. Eureka is one of the least cold-hardy lemon varieties and can be damaged by freezing temperatures.