Retaining Walls From interlocking blocks to timber. We can work with your ideas to build retaining walls that will match form to function. Johnston’s Greenhouse uses high-quality products to build retaining walls that will complement your home and provide the perfect design for your garden. If you have undesirable slopes on your property, a retaining wall will restrain soil and compliment your landscaping plants. Proper design and installation of a retaining wall can counteract the retained material from moving downslope. With over 20 years of experience, the landscaping team at Johnston’s Greenhouse will complete your project with precision and attention to detail. We back all our construction work with a full guarantee. Contact us today to get started on your project.