In a groundbreaking study conducted at The Ohio State University, researchers have found that ethephon substrate drenches can effectively regulate stem elongation in containerized herbaceous perennials. This innovative approach allows growers to produce uniform, high-quality plants, enhancing their appeal for retail markets without compromising plant health.
The study, led by research associate W. Tyler Rich, highlights the potential of ethephon drenches to transform growth management practices in the horticultural industry. As of May 2025, Collate® 2L remains the only ethephon product with EPA approval for both substrate drench and foliar spray applications, marking a significant advancement in plant growth regulation.
Controlling Stem Elongation in Perennials
Targeted applications of ethephon drenches have shown promising results in controlling plant height among various herbaceous perennials. This method not only ensures uniformity but also maintains the overall health of the plants, which is crucial for growers aiming to meet the aesthetic standards of retail markets.
According to the study, these controlled applications can significantly reduce the need for labor-intensive pruning, thereby lowering production costs and increasing operational efficiency. This development represents a major step forward in sustainable horticultural practices.
Growth Management in Annual Bedding Plants
A complementary study focused on annual bedding plants has further demonstrated the efficacy of ethephon substrate drenches. Researchers observed that these applications can effectively limit excessive growth, resulting in more compact and visually appealing plants.
This research offers valuable insights for growers seeking cost-effective growth management strategies in greenhouse and nursery production. By adopting these practices, growers can enhance plant marketability and sustainability, aligning with industry trends towards more efficient production methods.
Industry Implications and Future Prospects
The implications of this research extend beyond individual plant species, offering a broader impact on the ornamental horticulture industry. Effective height and growth control are essential for both aesthetic quality and operational efficiency, and these findings provide actionable information to support these goals.
W. Garrett Owen, an extension specialist and assistant professor of Sustainable Greenhouse Nursery Systems, emphasizes the importance of such research in advancing floriculture crop production. His work focuses on plant nutrition, growth regulation, and crop diagnostics, all of which are integral to the successful implementation of these new techniques.
“The research conducted at The Ohio State University provides a blueprint for growers to enhance plant uniformity and reduce labor costs, ultimately leading to more sustainable and profitable production practices,” said Owen.
Supporting Sustainable Horticulture
The findings from these studies are published in the ASHS HortScience electronic journal, a leading resource for horticultural science research. The American Society for Horticultural Science (ASHS), established in 1903, is a globally recognized professional society committed to promoting scientific research and education in horticulture.
With thousands of members worldwide, ASHS represents a diverse cross-section of the horticultural community, including scientists, educators, and industry professionals. The society’s focus on breeding, propagation, and sustainable practices underscores the importance of research like that conducted by Rich and Owen in advancing the field.
As the horticultural industry continues to evolve, the adoption of ethephon substrate drenches represents a significant step towards more sustainable and efficient production methods. Growers are encouraged to consider these findings as they plan for future crop cycles, ensuring that their practices align with both market demands and environmental considerations.
For more detailed information on this research, the full studies can be accessed through the ASHS HortScience electronic journal website at https://doi.org/10.21273/HORTSCI18418-24 and https://doi.org/10.21273/HORTSCI18579-25.
