John Terhesh
40 Under 40, Class of 2020

John Terhesh


Goodmark Nursery


• Researched and implemented a new water treatment system that eliminated biofilm buildup in drip lines. System helped reduce labor expenses by $50,000 and eliminated fungal and bacterial spores from the water.

• Managed a propagation and container operation and was able to increase production more than 100% and increase propagation success rates from 60% to 95%.


John likes to go backpacking. “I like the challenge and the simplicity of the days and exploring an area that few people have experienced. My favorite trip was the national lakeshore along Lake Superior.”

Fun Facts

John is a competitive curler. “It blends very well with the seasonality of the green industry and it keeps me active in the winter.”

Latest Photos see all »

GPN recognizes 40 industry professionals under the age of 40 who are helping to determine the future of the horticulture industry. These individuals are today’s movers and shakers who are already setting the pace for tomorrow.
Ben Vliestra
Sidney Phelps
Jennifer Moss
Daniel Norden
W. Garrett Owen
Jessica Montgomery
Elien Peters
Rose Oberholzer
Nikki Melin

March 2021 GPN
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