MAILING ADDRESS: Texas Plant & Soil Lab 5115 W. Monte Cristo Rd. Edinburg, Texas 78541 Physical Address: FM 1925 3 1/2 Mi. W of US 281 Hours: Monday thru Friday 8:00 am--5:00 pm CST Summer Hours: July-September Monday thru Thursday 8:00 am--5:00 pm CST Friday 8:00 am--12:00 pm CST