My Educational Programs / Sessions @ Cultivate

Successful Potted Herb Production
Saturday, July 15 • 9:00 AM - 10:00 AM

Temperature, day length, and light intensity greatly affect growth of herbs. But which temperatures and day lengths should be used for each? What temperatures are best for propagation (seed germination and cutting rooting). What fertilizers should be used? Our speaker will answer these questions and cover pH, fertilizer type, and fertilizer amounts as they affect different herb growth.

Successfully Growing the Big Three: New Guinea Impatiens, Geraniums, and Fuchsia
Sunday, July 16 • 9:30 AM - 10:30 AM

This session will go over the most common issues and solutions related to growing New Guinea Impatiens, Geraniums, and Fuchsia that occur across the country. Our speaker will focus on common temperature, light and nutritional problems that can occur with each and solutions to fix each problem. In addition, common disease, pest issues, and solutions will be covered.

Back2Basics: Problem Solving Crop Production Issues
Monday, July 17 • 9:30 AM - 10:30 AM

Determining what is causing a crop production problem can be difficult. How and where a problem occurs can give you a clue to what the problem is. This session will go over step-by-step ways to help use symptoms to diagnose crop production issues.


    John Erwin

    Professor and Chair, Plant Science & Landscape Architecture at University of Maryland


    • B.S. Ornamental Horticulture Delaware Valley College of Science and Agriculture (1983)
    • M.S. Horticulture Michigan State University (1986)
    • PhD. Horticulture Michigan State University (1989)

    John is from southeast Pennsylvania and graduated with degrees in horticulture from Delaware Valley College and Michigan State University. John helped develop the concepts of DIF, DROP and DIP used to control stem elongation today while in graduate school. Following college, he served as a Professor at the University of Minnesota where he identified how daylength, light intensity, and temperature affect the flowering of bedding plants, cacti and succulents, identified lighting protocols for leafy green crops, identified unique PGR combinations to control growth, and studied high-temperature effects on flowering and root development. John recently became the Chair of the Department of Plant Science and Landscape Architecture at the University of Maryland where he continues his research. Aside from academics, he has been a production consultant for 4 of the top 10 growers in the US for 30 years.

    University of Maryland -- Agriculture, Plant Science & Landscape Architecture
    Founded in 1856, the College of Agriculture and Natural Resources is the Cornerstone of the University of Maryland. Learn about our rich history, our current initiatives, our talented students, and our passionate faculty and staff.

    4291 Fieldhouse Dr BLDG 2104 College Park, MD 20742
    Email:     Contact:   John Erwin
    Phone:  301-405-3341   FAX: 



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