How are new plant varieties tried and tested?

New plant varieties don’t just appear in catalogs—they undergo rigorous, multi-year trials to prove they’re worth growing. At Ryman Gardens in Ames, horticulturist Jessie Liebenguth explains how programs like All-America Selections and regional trials test new plants for disease resistance, climate adaptability, and performance across diverse conditions. The process isn’t about flashy looks alone; it’s about real-world success for home gardeners and small farms. One standout example: a basil variety called Piedmont that resists devastating downy mildew and thrives in Iowa’s humid summers, with judges harvesting it by the bagful. Even roses, dahlias, and kohlrabi are evaluated not just for beauty but for resilience, yield, and ease of care. The episode reveals that the 'perfect' plant is often one that survives pests, weather extremes, and poor soil—proving that sustainability beats spectacle in modern horticulture. Beyond trials, the show tackles real gardener dilemmas: why plum trees produce misshapen fruit after a cold spring, how to manage invasive sumac without killing the parent plant, and whether to save a ginkgo by rooting cuttings. Experts stress patience—many trees are just late to leaf out after a harsh winter—and warn against common mistakes like planting too close to old stumps or using sand to fix clay soil. The takeaway?