About Discover why Johnston’s Greenhouse has been the first choice of Peterborough gardeners for more than 50 years. Sourcing your plants and gardening supplies from a quality garden centre is essential to your planting success. Johnston’s Greenhouse is proud to offer some of Peterborough’s highest quality plants, flowers, trees, shrubs, and other gardening supplies. We offer a consultative approach to gardening and landscaping design and welcome novice gardeners all the way to experienced horticulturists. Johnston’s Garden Centre is set up in a way that provides an easy shopping experience. As a family-run business in Peterborough, our staff are active gardeners in the community that share practical advice to help our community build the perfect gardens!