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. 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...

Craig Regelbrugge March 05 2019

AmericanHort and our foundation, the Horticultural Research Institute (HRI), joined with co-founders of the National Pollinator Garden Network and others to announce the achievement of the Million Pollinator Garden Challenge. The goal of a million gardens to help sustain the health of diverse pollinator populations was not only achieved, but it was also exceeded. Here are a few of the key metri...

Jill Calabro, Ph.D. February 19 2019

Authors: Jill Calabro, PhD, & Craig Regelbrugge

With the new spending agreement signed into law, the U.S. Department of Agriculture (USDA) is allocating $66 million to support 407 projects that will strengthen the nation’s infrastructure for pest detection and surveillance, identification, threat mitigation, and safeguard the nursery production system. USDA provides fun...

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...