Alpha Landscapes

About Us


ALPHA Landscapes is a dedicated new-construction landscape firm serving all of Iowa.  We are a truly turn-key landscape contractor focused on providing the highest quality, most budget and schedule-friendly product to our clients and partners.

Riley Marvin’s landscaping career began around 2013, dragging his dad’s push mower around the neighborhood, mowing lawns after school.  After a brief hiatus following his junior year at Iowa State ALPHA Landscapes was formed. 

Originally specializing in residential projects, the business quickly shifted towards Riley’s vision of becoming a commercial new construction contractor.  In the fall of 2019 Sohn Wallace came on as the general superintendent, and the rest is history.

ALPHA Landscapes, has continued to grow rapidly in our niche of commercial landscape installation, growing from 4 employees in the spring 2019, to nearly 40 going into the 2023 season.



Create opportunities for our team to flourish by providing our clients with quality, timely, and competitive landscape construction services through the use of both proven and innovative methods.



To become a landscape construction industry leader by focusing on creating value for our employees and clients.


Core Values:

  • Put Safety First
  • Be Dependable
  • Never Stop Growing

Riley Marvin

Office Manager

Taylor Fitzsimmons

Taylor grew up in Johnston, and joined ALPHA in 2022 after working for a local mechanical contractor.  Taylor has a degree from UNI and handles all accounting and HR functions in the office.

Estimator/Project Manager

Andrew Doyle

Andrew has an extensive background in the landscape and turf management business, after being a branch manager for another landscape firm, he joined ALPHA in 2022.  Andrew also played college baseball at the University of Oklahoma and in the Texas Rangers organization, and has a degree in horticulture.

General Superintendent

Sohn Wallace

(Pronounced “Shawn”) Sohn has been in the construction and landscape industry for over 35 years, and is in charge of all field operations within the company.  A man of his word, if Sohn says we are going to be there, you best believe it.


Colton Ballantyne

Colton works as a field superintendent and helps with the day-to-day field operations of the company.  Colton has over 10 years of experience in the landscape & construction industry, and attended Iowa State for horticulture.

Project Engineer

Connor Wallace

Connor has been completing project estimating in the office since 2020, Connor is a team player and splits his time in the field to help maintain accurate production rates for our estimating process.  Connor attended Graceland university and played soccer.

Chief Fur Officer


Nala is a 1 year old golden retriever whose job is to ensure someone is always throwing the ball for her. On her off time she enjoys watching paw patrol and taking a nap anywhere other than her dog bed.