Willamette Valley Event: The Ancient Problem of Horsetail
Jan 17 @ 12:00 pm – 1:30 pm

The Ancient Problem of Horsetail – Can We Design Around It

This lecture has been approved by the Oregon Chapter of ASLA for 1.0 Health, Safety and Welfare PDH for Oregon Registered Landscape Architects.

Dan Sutton, Senior Vice President, Rexius Forest By-Products Inc.
Marina Wrensch, RLA, ASLA, LEED AP BD+C, CSI
Mark Spies, Landscape Construction Manager, Rexius Forest By-Products Inc.

Event Location/Time:
Oregon Electric Station
27 East 5th Avenue, Eugene 97401


Horsetail is prevalent in the Willamette Valley and is one of the few unwelcome surprises that can quickly turn a carefully crafted masterpiece into a public eyesore.  This presentation will focus on learning more about how horsetail arrives to the project site, what the designer can do to help minimize its existence, and what can be done to eradicate or control it once it appears.  The discussion will be in a panel format including speakers with experience and/or expertise in each of the above areas.

Learning Objectives:
1) Understand how soils are created and how horsetail gets introduced into soil mixes.
2) Understand what options are available to designers to minimize the occurrence of horsetail on a project.
3) Understand the most successful options to control and/or remove horsetail from a project site once it appears.

About the Speakers:
Dan Sutton: Senior Vice President, has been with the company since 1978.  He is responsible for overseeing the marketing and sales for Rexius, including product and service development. He is specifically responsible for the formulation of all the company’s soil blends for commercial growers, and landscape soils for both commercial and residential applications.  His 40 years of experience with Rexius gives him a great deal of practical insight into the various concerns with quality and performance of soils for their intended use.

Marina Wrensch was born and raised in Germany, where she graduated from university in 2001 as Graduate Engineer in Landscape Design. Marina received a Fulbright Scholarship to study at the University of Oregon where she graduated in 2005 with a bachelor and master’s degree in landscape architecture. She worked in landscape architecture for several years in Germany and since 2007 here in Eugene, both with Satre Associates and since early 2010 at Cameron McCarthy; she became licensed in 2011. Ever since graduating high school Marina has been exposed to horsetail in landscapes, both on the maintenance side in Germany and during her years as a landscape architect here in Oregon.

Mark Spies manages the Landscape Construction Department at Rexius which utilizes 45 employees to install residential and commercial landscape projects in the Eugene and Springfield area.  He is a licensed Landscape Professional, all phases, with the Oregon Landscape Contractors Board; a licensed contractor with the Oregon Construction Contractors Board; and a licensed commercial herbicide applicator. He graduated in 1984 from OSU with a bachelors in business and a horticulture minor and now has over 34 years of experience as a landscape professional. Through his years of experience, the avoidance and control of horsetail has been an ongoing challenge.

2019 ASLA Oregon Design Symposium
Apr 6 all-day

The 2019 Design Symposium will be on April 6th, 2019, at the Oregon Zoo. Check back for more information as we get closer to April!

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May 7 – May 9 all-day