Case Study: John Muir National Historic Site
- Food supply improvement
- Biodiversity/habitat protection and enhancement
- Recreational/visible green space enhancement
- Enhanced resilience to withstand change
- Pest control
- Soil enrichment
- Continuously Improve Environmental Performance
- Be Energy Smart
- Be Water Wise
- Reduce, Reuse, and Recycle
- Preserve Outdoor Values
- Adopt Best Practices
- Foster Sustainability Beyond Our Boundaries
- Two parts brown material (carbon) to one part green material (nitrogen)
- Ideal for use with woody plants
- Two parts green material to one part brown material
- Ideal for use with herbaceous vegetation and turf
Year: Ongoing, beginning in 2009
Landscape debris diverted from landfills: 1,000 pounds/year*
NPS Green Parks Plan Features
To retain nutrient-rich organic material on-site and divert landscape debris from landfills.
John Muir National Historic Site in Martinez, California preserves John Muir’s (1838–1914) home and grounds, and memorializes his contributions to the environmental conservation movement and the establishment of the U.S. National Park System.
Set in the Alhambra Valley, John Muir National Historic Site is one of few remaining fruit ranches in a region once dominated by agricultural production. The gardens and managed agricultural lands associated with Muir’s high-style Victorian home and the Martinez Adobe (9 acres), Mount Wanda’s wooded hillsides and remote grasslands (326 acres), and the streamside setting of the Strentzel-Muir gravesite (1 acre) provide a portrait of the once sprawling 3,200-acre Strentzel-Muir Ranch.
Tasked with preserving and rehabilitating the historic landscape to reflect its appearance around 1914, at Muir’s death, John Muir National Historic Site staff identified landscape debris composting as a grounds maintenance practice that was both in-keeping with the site’s historic dryland agricultural use and consistent with Muir’s environmental ethic and background as a scientific farmer. At the same time, park staff was also challenged to reduce the use of synthetic fertilizers and the amount of landscape debris sent off-site, while enhancing soil fertility, improving plant health, and combating evaporation.
Healthy soil is a catalyst for many factors that promote the resilience of cultural landscapes. Nutrient rich soils promote vegetation health by making nutrients available to plants and encouraging root hair growth. Microbial activity in compost promotes balanced soil ecology by keeping harmful microbes and organisms in check. Mulching reduces evaporation rates and the need for landscape irrigation.
At John Muir National Historic Site, park staff, volunteers, and Youth Conservation Corp members add landscape debris to compost piles on an ongoing basis. With collection bins in park lunchrooms, food waste is also collected for compost piles. Offsite landscape materials are not added to the compost piles, ensuring a closed system.
During the two-week establishment period, compost piles are monitored for moisture and temperature and turned by tractor every three days. Following establishment, compost piles are monitored and turned monthly. Exothermic activity is necessary to support the break-down of landscape debris and kill weed seeds. In the event of low ambient temperature, compost piles are solarized by covering with black plastic.
Ample space is also a significant requirement for a successful compositing operation, with each compost pile occupying upwards of 500 square feet. Turning comparably sized piles requires up to a 4,000 square-foot work area for tractor maneuvering. Finished compost is hand screened through a custom-built 1” x ½” mesh screen placed over an eight-foot pickup truck bed.
Increasingly, the composting program at John Muir National Historic Site engages park volunteers to help build, monitor, and distribute compost. Park staff is also evaluating opportunities to interpret the composting program for visitors. Demonstrations allow green practices to be shared beyond park boundaries, and with the John Muir National Historic Site compost operation generating more finished material than can be used on site, excess material is made available to park volunteers and staff.
Compostable Landscape Materials
“Green:” Grass clippings, perennials, shrub clippings, fruit and vegetable waste, weeds (within reason)
Healthy Compost Factors
Moisture: Compost piles should be damp, but not saturated. During periods of low precipitation, piles may require irrigation to keep them from drying out. During periods of high precipitation, piles may need to be covered to keep them from becoming too wet.
Temperature: Compost piles must reach and maintain a temperature of 131 degrees Fahrenheit for three consecutive days to kill weed seeds. Temperature should be measured regularly with a soil temperature probe.
Aeration: Compost piles must be turned to promote beneficial microorganisms and discourage anaerobic bacteria. For large compost piles, turning with a skid loader, bucket loader, or self-propelled turner (for windrow composting) is necessary.
Mulch: Spread on planting beds to improve soil fertility and plant health, and reduce evaporation rates
John Muir National Historic Site is committed to reducing energy consumption and conserving resources across all departments, not only in the landscape. Upgrading light bulbs and monitoring thermostat settings in buildings has yielded energy savings, and a recently installed real-time energy monitoring system enables the park facility manager to target additional efficiencies.
In 2008, a patch of lawn in front of the visitor center was converted to a California native plant garden to demonstrate the utility, efficiency, and beauty of native perennials and to promote the removal of water inefficient turf. In 2010, the garden was expanded to create a native bunch grass meadow in the narrow strips surrounding the visitor parking area. For most of its irrigation needs John Muir National Historic Site maintains two original, historic water wells and has drawn from this renewable source for many years.
The orchards and grounds at John Muir National Historic Site are generally considered to be working landscapes, where maintenance activities and cultural practices are not necessarily hidden from public view. The composting project is a perfect example of this philosophy. We invite the public to ask questions about the operation in order to highlight the sustainability benefits of keeping green waste on site and returning it to the landscape to improve soil health and plant resiliency.
Questions about John Muir National Historic Site’s composting and grounds maintenance operations or how to join as a volunteer may be addressed to: John Muir National Historic Site Superintendent.