How Ethephon Drenches Control Plant Growth: Tips for Growers (2025)

Unlocking the Secrets to Perfect Plants: Ethephon's Power Unveiled

The quest for optimal plant growth and aesthetics has led scientists to a groundbreaking discovery. But can a simple chemical solution really revolutionize the horticulture industry? Let's dive in.

Stem Elongation Control: A Delicate Balance

In a fascinating study, researchers explored the potential of ethephon substrate drenches to manage stem elongation in potted perennials. The findings revealed that precise applications can curb excessive growth while maintaining plant vitality. This means growers can achieve consistent, visually appealing plants, ready for retail shelves.

Annual Bedding Plants: Compact and Captivating

A companion study focused on annual bedding plants, showing that ethephon drenches can significantly restrain excessive growth. The result? More compact plants with enhanced visual appeal. This is a game-changer for growers aiming to optimize production and appeal, especially in greenhouses and nurseries.

Industry Impact: Beyond Aesthetics

The implications of this research extend far beyond visual appeal. Effective height and growth management are crucial for the overall success of ornamental horticulture. By following these techniques, growers can achieve uniform plant sizes, minimize labor-intensive pruning, and boost crop marketability, all while embracing sustainable and profitable practices.

Meet the Minds Behind the Research

W. Tyler Rich, a research associate and Master's degree holder from The Ohio State University, led this innovative work. The study aimed to expand the uses of Collate® 2L (ethephon), and as of May 2025, it remains the sole ethephon product approved by the EPA for substrate drenches and foliar sprays. These findings are a green light for growers to adopt this method, ensuring timely applications and responsible use in floriculture.

W. Garrett Owen, an extension specialist and assistant professor, focuses on sustainable greenhouse nursery systems. His expertise in floriculture production, plant nutrition, and growth regulation aligns perfectly with this research.

Explore the Full Story

For a comprehensive understanding, access the full research articles on the ASHS HortScience journal website: https://doi.org/10.21273/HORTSCI18418-24 and https://doi.org/10.21273/HORTSCI18579-25.


The American Society for Horticultural Science (ASHS): Leading the Way
ASHS, established in 1903, is a renowned global authority in horticultural science. With a diverse membership, including scientists, educators, students, and industry professionals, ASHS champions research and education across all horticulture sectors. Learn more at ashs.org.


But here's the twist: While these findings offer exciting possibilities, they also raise questions. Could this chemical solution be a double-edged sword? What are the long-term effects on plant health and the environment? Share your thoughts below, and let's spark a conversation on the future of sustainable horticulture.

How Ethephon Drenches Control Plant Growth: Tips for Growers (2025)
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