With a temperate, Mediterranean climate, Glenn County's Orland area is the northernmost commercial citrus growing area in California.
- Cost Studies - Citrus
- Tree and Vine Loss Calculator
- CIMIS - California Irrigation Management Information System
- Crop ET Data and Weekly Soil Moisture Loss
- Fruit & Nut Center - Citrus
- IPM Guidelines - Citrus
- Citrus Growers' Educational Seminar - October 29, 2008