
What makes a well-performing plant? Is it the perseverance to not only maintain extensive, healthy roots in the soil, but to also keep sprawling foliage and floriferous blooms above ground, when rainclouds refuse to come out for weeks at a time? Or perhaps it’s the magnetic effect that draws in pollinators such as bees and butterflies.
Fortunately for the horticulture industry and end consumers, growers, breeders, universities and botanical gardens employ trial garden managers who monitor the progress of numerous varieties in their gardens, and welcome visitors to gauge those plants’ attributes for themselves. Some of these attributes include drought tolerance, heat tolerance, pollinator friendliness and overall performance.
- Northeast region results
- Southeast region results
- Midwest region results
- Southwest region results
- West region results
In our 2018 trial garden results, managers from respected institutions across the United States look at these criteria for annuals and perennials, and select their best-performing plants of the year. See which of these plants you might want to consider growing in your greenhouse next year.
Explore the November 2018 Issue
Check out more from this issue and find your next story to read.
Latest from Greenhouse Management
- Voting now open for the National Garden Bureau's 2026 Green Thumb Award Winners
- WUR extends Gerben Messelink’s professorship in biological pest control in partnership with Biobest and Interpolis
- Lights, CO2, GROW!
- Leading the next generation
- The Growth Industry Episode 8: From NFL guard to expert gardener with Chuck Hutchison
- The biggest greenhouse headlines of 2025
- Theresa Specht
- 10 building blocks of plant health