Full-service landscaping construction services for over 20 years! Posted on February 7, 2017, Edited March 29, 2017 by Chris Heckel Johnston’s Greenhouse has built a strong reputation for quality landscaping across Peterborough & the Kawarthas of which we are very are proud. We provide professional landscaping services including custom gardens, natural stone creations, retaining walls, decks, fences, and ponds. For the greatest effect and a lasting impression, landscaping should be designed by professional landscapers. View more landscaping services here.