HARRISBURG, Pa. - Pennsylvania's first Certified Landscape Technician (CLT) certification testing was offered Aug. 15-16 at the Penn State-Berks Campus in Reading. In celebration of CLTs first offering in Pa., candidates who took the test on those dates received a one-time opportunity to retake for free any problems they don't pass. This can be a substantial savings as retakes for six problems, the maximum allowed, cost $150. The state's CLT administrator is the Pennsylvania Landscape & Nursery Association.