Last Saturday, TerraFuture held our annual Spring Restoration Day, and by every measure it was our most impactful single-day event to date. Across six sites spanning the Portland metropolitan area, 503 volunteers contributed a combined 2,012 hours of labor to plant 2,000 native trees, shrubs, and groundcovers, remove 3.2 tons of invasive vegetation, and restore 14 acres of degraded riparian and upland habitat.
These are satisfying numbers. But the story behind them matters more than the totals.
The Sites
This year's restoration focused on three riparian corridors and three upland prairie remnants, selected based on our habitat connectivity analysis that identifies the most ecologically strategic locations for restoration investment.
Johnson Creek at Tideman Johnson Park received 450 native plants along 1,200 linear feet of stream bank, including red osier dogwood, Pacific willow, and sword fern. This section of Johnson Creek currently scores 42 out of 100 on the Oregon Department of Environmental Quality's habitat quality index. Our target is to reach 65 within five years as the plantings establish.
The Oaks Bottom Wildlife Refuge site focused on removing invasive Himalayan blackberry and English ivy from a 3.5-acre section and replanting with native shrubs including Oregon grape, snowberry, and red flowering currant. Volunteer crews removed an estimated 1.8 tons of invasive biomass from this site alone.
At our Powell Butte Nature Park prairie site, volunteers planted 600 native bunch grasses and wildflowers in areas cleared through prescribed burns conducted last fall. Roemer's fescue, blue wild rye, and camas made up the bulk of the prairie planting palette.
Why Native Plants Matter
The ecological rationale for native plant restoration is grounded in measurable relationships. Research from the Xerces Society shows that native plants support 10 to 50 times more pollinator species than non-native ornamentals. A single native oak tree supports over 500 species of caterpillars, which in turn feed migratory and resident bird populations. Non-native ornamental trees typically support fewer than 5 caterpillar species.
Our own monitoring data from previous restoration sites shows that native plant establishment leads to measurable increases in bird species richness within two to three years, with an average increase of 34 percent in bird species observed at restored sites compared to pre-restoration baselines.
Restoration is not about making a place look natural. It is about rebuilding the ecological relationships that support entire food webs, from soil microbes to migratory birds.
Volunteer Demographics
One of the most encouraging aspects of this year's event was the demographic breadth of our volunteer base. Registration data shows that 38 percent of volunteers were participating in a TerraFuture event for the first time. Thirty-one percent were under 25 years old, and 44 percent identified as people of color, reflecting the diversity of the communities where we work.
We also saw strong participation from corporate volunteer groups, with teams from 8 local employers contributing 142 of the total volunteers. Post-event surveys showed a 96 percent satisfaction rate and 82 percent of participants indicated they would return for future events.
Measuring Long-Term Impact
Planting is only the beginning. TerraFuture's restoration monitoring protocol tracks plant survival, canopy closure, invasive species recurrence, bird and pollinator diversity, and water quality at all restoration sites for a minimum of five years post-planting.
Our historical data shows that first-year survival rates for native plantings average 78 percent when sites receive two follow-up maintenance visits in the first growing season. Without maintenance, survival drops to 51 percent. This is why we budget 40 percent of our restoration program costs for post-planting care, a ratio that many organizations underinvest in.
The 2,000 plants in the ground today represent a long-term commitment. Over the next decade, these plantings will sequester an estimated 48 metric tons of CO2, filter approximately 2.3 million gallons of stormwater, and create habitat for dozens of native species. That is the return on a single day of community effort.
We are already planning for fall restoration season. If you missed Spring Restoration Day, mark your calendar for October 19.
