Hundreds of new perennial varieties enter the market each year. Only extended, side-by-side testing determines which ones deliver consistent performance in Midwest conditions. The Chicago Botanic Garden runs one of the largest such programs in the country, focusing on plants suited to local soils and climate.
Why Rigorous Testing Matters
Gardeners face a steady stream of introductions promoted for color, size, or novelty. Many fail to overwinter well or succumb to common pests and diseases after the first season or two. Comparative trials reduce that risk by growing multiple selections together under identical conditions for several years. Results give clear guidance on plants that earn their place in real gardens rather than catalogs. The program evaluates both new releases and established cultivars. It tracks overall habit, flower production and quality, foliage health, and winter survival. Data from these studies appear in the Garden’s own Plant Evaluation Notes as well as national publications, translating research into practical recommendations.
How the Evaluation Works
Perennials remain in trial for four full years. Shrubs and vines receive six years of observation. Plants are rated on a five-star scale that considers every aspect of garden performance. Observers note any reseeding, spreading tendencies, or susceptibility to insects and pathogens. Only selections that maintain strong ratings across all criteria receive top marks. Trials occur in dedicated spaces, including the Bernice E. Lavin Plant Evaluation Garden. Side-by-side planting allows direct comparison of similar species or cultivars. This setup highlights subtle differences in vigor and reliability that single-plant displays cannot reveal.
Plants Currently Under Study
Twenty comparative trials run at any given time. Recent and ongoing work includes hyssops, false indigos, burnets, goldenrods, and several hydrangea species. Additional trials examine abelias, bugleweeds, goatsbeards, sedges, clematis, hellebores, and stonecrops. Each group receives the same careful monitoring for hardiness and ornamental value. These genera represent both native and introduced plants. The goal remains identifying selections that thrive without excessive maintenance in USDA Zone 5 and 6 conditions typical of the Chicago region.
Practical Value for Home Gardeners
Published results help narrow choices when shopping for new additions. Instead of relying on marketing claims, gardeners can reference performance data gathered over multiple seasons. Top-rated plants have already demonstrated they can handle local winters, summer heat, and typical soil challenges. The program also supports the Chicagoland Grows introduction initiative, which brings promising selections to the trade. This pipeline connects research directly to nursery availability. Gardeners gain access to plants already vetted for regional success. Ongoing evaluations continue to refine recommendations as new varieties appear. The steady flow of data keeps advice current and grounded in observed results rather than initial impressions.
AI Disclaimer: This article was created with the assistance of AI tools and reviewed by a human editor.