Future Garden Expansions

In 2018, the City of SeaTac in partnership with the Highline Botanical Garden Foundation contracted with Site Workshop to complete a master plan for the remaining 5 ½ acres of undeveloped property that is part of the original agreement with the City for a public garden.  

Site Workshop, a Seattle-based landscape architectural firm was selected to work with community stakeholders, City staff and members of the Foundation Board of Directors to develop a plan.   Site Workshop, best known for its development of the Amazon Spheres in Seattle, are advocates for the artful transformation of public spaces.   They work in a collaborative process including community engagement, site design, concept development, presentation drawings and conversations which have resulted in an imaginative master plan for the site’s future expansions.  

A conceptual drawing of the master plan appears below:

As the site map indicates, the major features of the Master Plan include the following: •   

The visitor center as a catalyst for growth:  The visitor center is planned for the Southeast end of the Garden property with access off 24th Avenue South and some limited parking. The Center as proposed will include 1 or 2 large meeting rooms with multiple uses like receptions, weddings or classroom use, public bathrooms, a gift shop, some offices and record storage space. The visitor center will have the capacity for programs, conferences and community use encouraging local residents and visitors to the area to visit and enjoy the Garden. 

Adjacent Event Meadow: Near the visitor center, the event meadow can provide outdoor formal and informal meeting space.

Showcase for sustainable development best practices: This is space designated for demonstrations of innovative gardening techniques.

Canopy walk and Woodland restoration celebrating ecological succession with Pacific Northwest plants: This can provide an overhead view of the forested section west of the Paradise Garden with views of the woodlands, birds, and other features.

Restored Wetland and boardwalk: West of the Paradise Garden, there is currently a storm water retention pond that can be developed into a restored wetland surrounded by a boardwalk.

Amphitheater and performance space: This is a terraced outdoor seating area which would be built at the Northwest corner of the undeveloped property.     

Nature Play: This is the proposed children’s garden area south of the current plant propagation site and greenhouse. Using natural structures and natural settings, this is proposed to be a children’s garden.

Foundation Ruins Garden: This area at the Southwest corner of the Gardens would be cleared of invasive plantings and pathways around the foundations and steps of former houses that once existed on the property.

Expanded Pea-Patch and community pavilion


Entry Sign and way-finding signs

Additional Display Gardens   

Seike Gateway and Expansion