University of California, Riverside Citrus Variety Collection

The University of California Riverside Citrus Variety Collection holds around 1,800 trees representing 640 different citrus types and related plant species for ongoing research. The site is organized like a living library where scientists study how these varieties perform and respond to different growing conditions.

The collection began in 1907 as the UC Citrus Experiment Station and quickly became a center for improving citrus growing methods. Over the decades, more than 40 new varieties were developed here, and scientists worked to find ways to fight agricultural diseases.

The collection reflects California's deep connection to citrus farming and remains important to the region's agricultural identity. Walking through it, you notice how the different varieties tell a story about what has mattered to local farmers for generations.

The site sits in an area with good growing conditions for citrus and is reasonably accessible by car, though checking ahead for visiting hours is wise since it remains an active research facility. Comfortable walking shoes are useful, as exploring the grounds takes you through different sections of the collection.

Work done here led to the discovery of biological methods for controlling pests, techniques that farmers still use around the world today. These breakthroughs came from watching how different insects and plants interact with each other over many years.

Website: https://citrusvariety.ucr.edu

GPS coordinates: 33.97566,-117.33124

Latest update: December 10, 2025 20:10