From Michigan State University Extension: Each year, the Michigan State University Horticulture Demonstration Gardens evaluates hundreds of new annuals grown from seed or cuttings. Trial selections are supplied by private breeding companies and the plants are grown in MSU greenhouses and transplanted into either ground beds or containers after the last frost has passed which is late May or early June.
The performance of each plant in the trials is evaluated bi-weekly by Department of Horticulture staff on vigor, uniformity, ornamental value-flowers and foliage. In addition, disease and insect susceptibility is noted as well as effects of the climate that season. Seventeen companies supplied plants in 2012. Plants are rated on a 1.0 to 5.0 scale with 5.0 being the best performers.
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