About Us

Greenbank was created in February of 2004 by Kenneth Philp, principal of Kenneth Philp Landscape Architects. The goal of our experienced, knowledgeable landscape construction and maintenance staff is to provide care that upholds the integrity of high quality and detailed gardens and landscapes. We work with clients, builders and designers throughout the greater Seattle and Eastside areas.

Ken Philp

President & Senior Project Manager

Ken holds a bachelor’s degree in landscape architecture from the University of Washington and is a licensed landscape architect in the state of Washington. Ken currently lives near the city of Langley on beautiful Whidbey Island with his wife and daughters.

Samantha Idle

Maintenance Supervisor & Color Planting Specialist

Samantha holds an Associate’s Degree in Landscape Contracting from the State University of New York at Delhi. She was born and raised on Long Island, NY, but has lived in Washington since 1998. Samantha has been working in the landscaping industry for over 20 years and has been with Greenbank for eight of those years. She began her career as a teenager in her family’s landscaping business and as a designer in the family flower shop. With Samantha’s many years of experience and as a former arborist, she has a broad knowledge of proper pruning techniques, lawn maintenance and restoration, and perennial and shrub care. Her passion and specialty is designing and installing seasonal color plantings that provide year-round interest. Samantha resides with her husband and their three children on their acreage outside of Monroe.

Mark Kihlstrom

Project Manager & Estimator

Mark has been in the construction business for 20 years specializing in high-end residential landscape construction. He has worked as both an arborist and horticulturalist and has experience procuring plants, sourcing exotic plant material, and propagating plants. Mark’s expertise includes all facets of landscape construction including earthwork, drainage, masonry, carpentry, irrigation, low-voltage lighting, planting design, transplanting large trees, and installation of pools, spas, ponds, and water features. Mark lives in Kenmore.

Rick Silva


Rick is a site contractor with extensive experience in commercial site excavation, site grading, underground utilities including storm, sewer, water systems, and equipment operation. Rick has supervised and managed site work projects for over 18 years in California, Hawaii, and Washington states. Projects have included federal and state jobs, as well as large-scale residential developments, ranches, and commercial installations.

John Hoiland


John is a Washington native who has enjoyed travelling throughout the world, an opportunity his father’s work afforded him. His travels brought him to Washington, D.C. for junior high school and Frankfurt, Germany for high school. After graduating from Augsburg College in Minneapolis, John followed his passion for landscape and plants working in wholesale nursery management. After several years, he joined the Peace Corps and worked for two years in Kenya as an agro-forestry extension agent. When John completed his Peace Corp term, he travelled through several other African countries and discovered just how remote Timbuktu really is. Upon his return to Seattle, John returned to nursery management where he expanded his work into landscape construction. John now has over 25 years experience working in both commercial and residential landscape construction.