Ambrosia Gardens Landscaping / McKay Nursery Share: Landscaping Ambrosia Gardens Landscaping / McKay Nursery Visit Website 360 5th Ave N Onalaska , Wisconsin 54650 608-796-0911 About Map About We are a landscape design and install company located in Onalaska Wisconsin. We are partnered with McKay Nursery since 2006, a company based out of Waterloo Wisconsin with 120 yrs. of operations. What's Nearby? Distance: 5 10 15 20 25 50 mi.