1970: Started as the Old Mill Garden Center on 1.5 acres.

1989: Tim and Diane James began plans for 200 acres of vacant land near Lake Geneva, WI. The land was later converted into a large nursery. Today, all Atrium Garden Center’s trees and shrubs are transported from this off-site facility, which includes a huge variety of Maple species including Autumn Blaze, Red Sunset, and Crimson Queen.

2003: Opened the "new" Atrium Garden Center featuring magnificent 1-acre greenhouses where they grow all hanging baskets, potted annuals, 1-gallon perennials, chrysanthemums and poinsettia's. Also housed in the greenhouses is a full collection of opulent, one-of-a-kind fountains and statuary from Henri Studio. Outdoors, the Atrium proudly features an expansive collection of trees, shrubs, and evergreens from their 200-acre nursery in Wisconsin. Uniquely-shaped topiaries are also available.

The Atrium's two-tier 14,000 square foot garden shop includes a vast selection of home and garden accents, tools, birding supplies, garden art, and a marvelous selection of both stone and fiberglass containers. Upstairs, the store features upscale contemporary patio furniture for outdoor living environments and sun porches.