Research Institute

The Horticultural Research Institute proudly supports scientific research and horticultural students for the advancement of the industry. HRI was established by industry leaders on the premise that no one could better direct needed research to advance horticulture than the very people who work in it, day in and day out.

Jill Calabro, Ph.D. December 09 2019

For more information, contact Jennifer Gray, Research Programs Administrator at jenniferg@americanhort.org or 614.884.1155
One of the most important tenets of plant pathology is that the first step to effectively controlling a plant disease is identifying its cause. Otherwise, control measures could be ineffective, le...

Jennifer Gray November 18 2019

By: J James Owen, Jr., Virginia Tech; Anthony LeBude, North Carolina State University; Jill Calabro, HRI; Jennifer Boldt, USDA-ARS; Jennifer Gray, HRI; and James Altland, USDA-ARS. 

Horticulture is a...

Jill Calabro, Ph.D. September 06 2019

It’s common knowledge that certain bacteria can make people sick, but did you know that bacteria can cause plant diseases as well? They most certainly do! The first bacterial pathogen to be identified was anthrax, a disease affecting sheep and cattle, in 1876. Shortly after that, the first bacterial plant disease was confirmed – fire blight on apples and pears.

Jennifer Gray August 09 2019

The Horticultural Research Institute (HRI), the AmericanHort foundation, is pleased to announce the receipt of $240,000 in donations during its reception, held in conjunction with Cultivate’19 in Columbus, OH. 


AmericanHort Contributor May 31 2019

Terri Brown; Marketing and Member Engagement, AmericanHort, TerriB@AmericanHort.org 

As an attendee or exhibitor at a trade show or conference, social media can help you and your business in a lot o...

Jill Calabro, Ph.D. May 01 2019

Effective May 20, 2019, some “regulated areas” for Phytophthora ramorum will no longer be regulated under the federal program, though “quarantine areas”, where the pathogen is established, will be.  Operationally, nothing really changes as this approach has been already in effect through federal orders previously established in 2014 and 2015.

Jennifer Gray April 17 2019

The Green Industry Research Consortium, with funding support from the Horticultural Research Institute (HRI), is launching the National Green Industry Survey this month.  This represents the seventh time that this survey has been conducted since 1989. The purpose of the survey is to document trends in production, marketing, and retailing practices in the U.S. green industry.


Jill Calabro, Ph.D. March 20 2019

The research collaboration focusing on rose rosette disease (RRD) announced a new resource to aid in the early detection of the disease. The two-page educational piece, titled ‘

Jill Calabro, Ph.D. March 20 2019

Pennsylvania may soon regulate as many as 120 plants over concerns of invasiveness. Many of these plants are common in environmental horticulture, while others have little if any commercial significance.

The Pennsylvania Landscape and Nursery Association (PLNA) asked its members via a survey to rate the 120 plants on their value to the industry. A reported forty-three members compl...

Jill Calabro, Ph.D. March 05 2019

AmericanHort and the Horticultural Research Institute are assisting a group of researchers focused on the growing challenge of weed resistance to herbicides. 
Even if you’re just concerned about persistent weeds, researchers need your input. Please take 5 to 10 minutes to complete this survey on herbicide-resistant weeds in nursery crops, Christmas trees, and lan...

AmericanHort will host a webinar to help green industry businesses and HR professionals plan for the 2021 season using H2 workers, J-1 interns, and other common visa types. Come listen to experts who will share informed opinions on what employers might expect as you navigate the approval process for 2021.


This program will feature brief agency updates from Kristi B...

Ralstonia solancearum race 3 biovar 2 (R3B2), a federal quarantine pest, was recently confirmed in a single geranium variety in a greenhouse in Michigan, the first confirmed case in the US since 2004. Diseased geraniums planted in the landscape can potentially infect other plants, including tomatoes, potatoes, peppers, and eggplant, and must be destroyed.
Since the detection was con...

A group of House lawmakers introduced a bipartisan agricultural labor reform bill on October 30. How does the bill address the current H-2A program? What options are available for existing workers without proper immigration status? What about enforcement provisions? And, where might there be room for improvement as the process advances?

This stacked panel of experts will plunge into the current and potential application of exciting new technologies showing promise in automating and innovating the management of nursery stock, and other environments including arboretums and forest stands. New technologies explored during this seminar include drone-based observation and sampling, canopy robotics, and a variety of radio-frequen...