ROSWELL, Ga.--(BUSINESS WIRE)--SiteOne® Landscape Supply, Inc. (NYSE:SITE), the largest and only national wholesale distributor of landscape supplies in the United States, announced today it has entered into a definitive agreement to acquire All Pro Horticulture, Inc. All Pro has one location on Long Island, NY and is a leading distributor of agronomics and erosion control products in the metro NY market. Completion of the acquisition is subject to customary closing conditions. "All Pro is a te