Close
lock and key

Sign in to your account.

Account Login

Four Star Partners with Growers and Retailers

Plants, Programs and Products for Horticulture

Four Star Greenhouse produces superb young plants and finished crops for the wholesale grower, retail grower, garden retailer and professional landscaper. We are the #1 supplier of Proven Winners® plants and products worldwide, and are dedicated to providing the best plants, products, programs and services possible.

As a founding member of the Proven Winners® brand, we invest strongly in research and development, and also breed many outstanding Proven Winners® and Proven Selections® brand plants. We’ve helped develop these plants because we know that growers, retailers and customers will be the most successful with top performing plants.

Our Proven Winners® premium grower and retail programs include:

These programs are specifically designed to deliver more profit per square foot for your operation and give customers gardening success.

Wholesale and Retail Grower Programs

At Four Star, our programs are designed to maximize grower and retailer profits: Our Supernova® liners shorten grow times and provide consistent flowering, helping you save money and increase profit margins. And our team of grower experts is available to offer a customized program to fit your needs throughout the year. 

Four Star provides young plants nationwide and has developed an extensive shipping and delivery program with options to save you time and money. Our finished plants are shipped regionally; visit the shipping page for more information. 

Growing since 1977

In 1977, Tom Smith planted the initial seed for Four Star Greenhouse when he began growing plants in Carleton, Michigan. Simply known as Smith’s Greenhouse, the business focused mostly on finished crops of bedding plants from seed, sold at market.

In 1982, Smith expanded his offerings and began producing starter plants, or “plugs,” to sell to growers. Four Star’s growing operations had grown from the initial 60,000 square feet to approximately 140,000 square feet (now the Indian Trail Road facility). Tom and Sharon Smith became the founders and respective president and vice president of the new company, Four Star Greenhouse Inc.

Moving into Vegetatively Propagated Annuals

In the late 1980s, Four Star began a relationship with Germany’s Kientzler when it began producing New Guinea Impatiens bred by Ludwig Kientzler. In his work with Kientzler, Tom Smith traveled throughout Europe meeting and listening to other breeders working on new and unique vegetative annuals, and his experience abroad eventually led to the creation of Proven Winners® in the United States in 1992.

The debut of the Proven Winners® brand placed a new emphasis on garden performance and plant brand in the horticulture industry, as growers began to adjust their business and operating practices to grow vegetatively.  More and more growers became Proven Winners® licensees, and many retailers adopted the premium brand strategy as the brand gained name recognition with consumers. The Proven Winners® partnership continues to market this brand heavily to consumers and the industry, adding Spring Meadow’s shrub line in 2004 as ColorChoice® shrubs, and perennials from Walters Gardens Inc. in 2011.

Research & Development — Growing New Varieties

Each year, thousands of varieties undergo our extensive Proven Winners® trialing process in hope of one day becoming a Proven Winner. Each year, only a select few make the cut.

Every Proven Winners® plant begins its life in a laboratory, free of viral contaminants and diseases. Varieties eligible to become Proven Winners® are then subjected to a rigorous series of tests over a two-to three-year trial process, during which we measure each variety’s performance in numerous greenhouse and landscape environments. Tests are conducted at multiple trial locations across the country.  The U.S. Proven Winners® propagator Trial Managers visit frequently for observation and evaluation, and if all propagators unanimously agree that a variety has exhibited exceptional garden performance, then it can begin production as a Proven Winners® variety.

Here at Four Star, we are proud to have a year-round team of experts dedicated to research and development.  With many years of combined experience and access to state-of-the-art facilities, they provide the proper care and environment for all the varieties in trial.  By focusing exclusively on trialing, our team is confident and knowledgeable when they recommend a variety for Proven Winners® introduction.

Research and development team
Research and development team

Four Star Continues to Grow

Today, Four Star Greenhouse has more than 20 acres of indoor growing area and four additional acres of outdoor growing space at the Carleton, Michigan headquarters.  Three recent greenhouse growing areas have been added for expanded production of annuals, perennials and shrubs.  The award-winning display gardens are open to the public and industry professionals in summer months, and showcase new and popular varieties. 

To contact Four Star or learn more, click here.

Four Star Greenhouse