The science behind your garden hydrangeas involves far more than just planting and watering. Dr. Lisa Alexander, a research geneticist with the USDA Agricultural Research Service, takes us on a fascinating journey from her first days pollinating chestnut trees in a 70-foot bucket truck to her current work revolutionizing hydrangea breeding at the National Arboretum.
Working from the heart of Tennessee's nursery country, Dr. Alexander explains how she's mapping the genetic diversity of oakleaf hydrangea across its six-state native range. Her team has identified six distinct genetic populations, some containing rare genes that might help plants survive drought or cold temperatures. This groundbreaking research comes at a critical time – they've discovered that urbanization has already caused these beautiful native plants to disappear from many previously recorded locations.
The economic stakes are significant. Hydrangeas represent a $155 million industry, ranking as the second best-selling woody shrub behind roses. By understanding the genetic blueprint controlling traits like plant size, flower structure, and environmental adaptations, breeders can develop improved varieties that combine beauty with resilience.
Dr. Alexander also discusses the exciting launch of "Hort Genomes" – a new initiative creating a dedicated home for specialty crop genomic data within the Journal of the American Society for Horticultural Science. This resource will accelerate research across horticultural fields by centralizing crucial genetic information previously scattered across publications or unavailable to the scientific community.
Whether you're a backyard gardener admiring your hydrangeas or a scientist breeding the next generation of ornamental plants, this episode reveals the remarkable intersection of traditional horticulture with cutting-edge genomics that's shaping the future of our gardens.

Read the JASHS article “Precipitation, Temperature, and Population Structure Influence Genetic Diversity of Oakleaf Hydrangea Throughout Its Native Range” at https://www.doi.org/10.21273/JASHS05255-22.

Learn more about the American Society for Horticultural Science (ASHS) at https://ashs.org/.
HortTechnology, HortScience and the Journal of the American Society for Horticultural Science are all open-access and peer-reviewed journals, published by the American Society of Horticultural Science (ASHS). Find them at journals.ashs.org.
Consider becoming an ASHS member at https://ashs.org/page/Becomeamember!
You can also find the official webpage for Plants, People, Science at ashs.org/plantspeoplesciencepodcast, and we encourage you to send us feedback or suggestions at https://ashs.org/webinarpodcastsuggestion.
Podcast transcripts are available at https://plantspeoplescience.buzzsprout.com.
On LinkedIn find Sam Humphrey at linkedin.com/in/samson-humphrey. Curt Rom is at https://www.linkedin.com/in/curt-rom-611085134/. Lena Wilson is at https://www.linkedin.com/in/lena-wilson-2531a5141/.

Thank you for listening!

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