Keller's Garden Center & Landscaping 7 KERN ST., EXETER, PA HOURS: MON-FRI 8:00AM-5:00PM, SAT 9:00AM-4:00PM, AND SUN 10:00AM-3:00PM. 570-299-7240 Keller's Garden Center & Landscaping 7 KERN ST . , EXETER , PA HOURS : MON - FRI 8:00 AM-5:00PM , SAT 9:00 AM-4:00PM , AND SUN 10:00 AM-3:00PM . 570-299-7240