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Urban tree canopies provide manifold benefits, such as: improved air quality, moderated temperatures, reduced storm water runoff, increased property value, reduced crime, improved visual aesthetics, and reduced health problems. Socioeconomically disadvantaged neighborhoods often have many fewer trees than other neighborhoods. This mixed methods case study explored approaches to expand the participatory process in tree stewardship with residents from a socioeconomically disadvantaged neighborhood in Washington, D.C. As a first step, we used semi-structured interviews to elicit residents’ experiences regarding nature and trees. We then built public-private partnerships to strategically convene multi-year tree planting efforts. We additionally performed targeted community outreach, developed a Tree Planting Challenge, and supported mural art to draw attention to the urban tree canopy. Ultimately, the mixed approaches resulted in more than 660 commitments to having free trees planted on properties in a matter of 12 months. We review these findings and discuss implications for future research into collective efficacy-building for a range of sustainability issues.