Who Are We?

Your Complete Landscaping Provider… Where Quality Counts!
Russell Irvin
Co-Owner & Principal

Richard Irvin
Co Owner & Member


Richard IrvinCo-Owner & Member of Nursery

Richard (Dick) Irvin didn’t always want to be a landscape entrepreneur. Back in his youth, after graduating from Washington College with a psychology degree, Dick, an avid golfer, decided to pursue a golf career. But like many dreams of our youth, his desire for a golf career took a back seat after getting married and starting a family. After a year of trying to make it as a golf professional, Dick decided to make a go at Landscaping. Dick worked for several landscape firms in the area, learning the business until he started his own company, RI Landscaping, in 1961. Combining his knowledge of landscaping and his passion and reputation as a semi-pro golfer, Dick was instrumental in designing the Black Horse Golf Course located in White Hall, Maryland.

Harry Irvin, after seeing his son Dick's success in the landscaping business, decided to expand the business by purchasing a rundown dairy farm in Baltimore County in 1965. Dick’s brother Tom joined his father and brother in the business, creating the acronym TDH. The business started out small, selling plants, perennials and small bushes. It would take Dick 3 years to clear the once overgrown 40-acre dairy farm on a Gravely tractor before the Nursery could truly expand. Today, TDH Nurseries has over 80 acres of property and is a premier nursery in Maryland, servicing many local landscape companies. Although Dick no longer manages the day-to-day operations of the nursery, you can still see him riding around in the fields, overseeing the property and working alongside the guys.

All of the professionals at TDH Landscaping put passion and attention to detail in their work. Whether you're working with an owner, designer, or accountant, you'll be met with personal quality. You can find out for yourself by contacting us today.

Sales Team

Nathan Boliek
Design/Sales Manager


Nathan BoliekDesign & Sales Manager

Nathan Boliek has been working in the landscape industry since 1978. A graduate of Dulaney High School, Nathan achieved an AA degree in Business Management from Essex Community College, where he studied landscape design. In 1981, Nathan started his own Landscape Design and Build Company. After 10 prosperous years, he sold his business in 1991. In March of 1991, Nathan started with TDH landscaping as a designer and sales representative. He was then promoted to Design/Sales Manager. Nathan manages a staff of designers and estimators. As an integral member of TDH’s management team, he serves as key decision maker for TDH. Due to his vast knowledge of the industry and experience owning his own business, he takes a lead role in managing the company and directing projects. Under Nathan's guidance, TDH has grown steadily over the past 24 years and accounts for millions of dollars in sales. Nathan is ICPI (Interlocking Concrete Pavement Institute) compliant as well as certified in the State of Maryland ESC (Erosion & Sediment Control). Nathan comes from a long line of farmers in Northern Baltimore County. This has inspired him to raise chickens, and he is in the process of adding a new German shorthaired puppy. He is an avid hunter, hiker and wood carver. He also enjoys singing, reading and gardening.

All of the team members at TDH Landscaping combine years of experience and a track record of success to make a difference for our clients. For more information on our exceptional approach to landscaping, contact us today.

Karen Gahs
Landscape Designer

Darlene Bonaccorsi
Landscape Designer


Darlene Bonaccorsi Landscape Designer

Darlene Bonaccorsi is our newest Landscape Designer and sales representative for TDH Landscaping with a passion for plants. Darlene completed the Master Gardener course in Harford County as a volunteer. As her education continued she knew she belonged in the horticulture industry. Following her passion, she switched careers and became an Outside Sales representative at TDH Nurseries in 2016 selling trees and plants to local landscapers. In her day-to-day interactions with clients, she soon realized that her true calling was Landscape Design and Maintenance. Darlene decided to further her education and attended classes and seminars at the University of Maryland. She then completed certificate programs at CCBC for Basic Horticulture Technician, and also for the Landscape Installation, Maintenance and Design program. In addition, she is a member of Phi Theta Kappa, and was on the Dean’s List.

Darlene has enjoyed volunteering as an Assistant Cub Master with Boy Scouts, and as a Co-Leader with Girl Scouts. She enjoys educating youth as well as adults in proper plant care and maintenance. She has also been involved in beautification of local public spaces. Darlene is always working to improve her craft, and attends horticulture events whenever possible.

In her spare time, Darlene enjoys vegetable and flower gardening at her home, using sustainable landscape practices. Her home is a certified Bay Wise property focusing on benefits to wildlife as well as conserving natural resources and improving water quality. She has a small hobby farm caring for chickens, ducks, and goats. She enjoys hiking, photography, reading, and spending quality time with her three children.


Production Manager

Bryant Clark
Production Manager


Bryant ClarkProduction Manager

Bryant Clark is the Production Manager for TDH landscaping, LLC. Previously working in the energy industry, Bryant has been with TDH for over 11 years and attributes his knowledge of project management to rolling up his sleeves, getting his hands dirty and doing the job from the ground up. He is a “hands on" manager right in there with his crew to make sure the job is done correctly and efficiently. His responsibilities include overseeing the daily projects, managing the field office, overseeing crew of over 35 employees and fleet management. Bryant is a graduate of Dulaney High School and is also ICPI (Interlocking Concrete Pavement Institute) compliant. As part of the management team, Bryant reports results and obstacles from production to Russ. This information is invaluable to effectively servicing our customers and growing the business. His problem solving skills have elevated TDH in customer service and raised high praise for the quality of our work. In his free time, Bryant is a duck and goose hunter. He is a father of two daughters and one step daughter.

he entire TDH Landscaping team takes a hands-on approach to customer service. Whatever your landscaping need, we'll make sure you're completely satisfied. Contact us today for more information.