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Newly planted apple orchard on 91�Թ��� campus is a nexus of university and community partnerships and will be a living classroom for students and educators

For now, they are twiggy little things, all spindly adolescent limbs that nevertheless hint at future harvests. Saturday morning, one even wore a scattering of creamy white blossoms—flowers that, in years to come, once roots have gained hold and branches have stretched up and out, will grow into apples.

Is there anything more hopeful than planting a tree? Yes, planting a whole orchard of them.

On Saturday, years of planning, research and partnership-building bore fruit on an L-shaped plot in front of the 91�Թ��� 30th Street greenhouse, where more than two-dozen volunteers planted 30 apple trees in what had previously been a scrubby patch of turf.

Funded by a $90,000 Sustainable CU grant, the apple orchard will not only be a classroom and a living lab, but a nexus for community, a carbon sink and a vibrant example that sustainability can be delicious.

“It’s so exciting to see this happening,” says Amy Dunbar-Wallis, who this semester completed her PhD in the Department of Ecology and Evolutionary Biology and collaborated with 91�Թ��� faculty and students and community partners to bring the idea of the first orchard on 91�Թ��� campus to fruition.

“It represents how so many people on campus, so many people in the community, have come together to plant this orchard that will be a place to learn and a place to preserve a really neat part of Boulder’s history.”

In search of old apple trees

The new apple orchard grew from the , an initiative that began almost 15 years ago with a simple observation: There seemed to be a lot of old apple trees in Boulder.

Katharine Suding, a professor of distinction in the Department of Ecology and Evolutionary Biology, had recently moved to the area, “and I was really surprised to see so many old apple trees everywhere,” she recalled during the . “I realized I had no idea about the histories and particularly the history of apples, so looking into it a little more, it was clear there are trees here that are remnants of past histories starting in the turn of (20th) century.

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Amy Dunbar-Wallis (left) and Tiffany Willis (right, EBio'22) consult a chart designating where each tree would be planted in the new apple orchard in front of the 30th Street greenhouse Saturday morning. Willis, who lives in Boulder, took EBIO 1250 online during Covid lockdowns and was a lab assistant for the class in 2021.

“There are apple trees in Colorado and in Boulder that are remnants from old orchards that still exist. There are also remnants of trees that were planted when people came and built ranches or had farms here, and often they were bringing along apple trees from where they came from, whether it was Germany, whether it was the Midwest, whether it was Scandinavia.”

In fall 2017, the Boulder Apple Tree Project (BATP) sprouted, combining historical sleuthing with cutting-edge genetic testing and grafting to not only locate and catalog Boulder’s historic apple trees, but also to revive its legacy of apple growing. In the ongoing project, researchers gather data on the age and health of the trees, as well as the type and flavor of the apples, and the genetic diversity that the trees offer to future populations.

Suding and BATP co-principal investigator Lisa Corwin, an associate professor of ecology and evolutionary biology, have worked with undergraduate and graduate students not only to gather data, but also to develop the EBIO 1250 course, during which students conduct research on Boulder’s apple trees; curricula and materials in partnership with the CU Museum of Natural History; a and in collaboration with computer science students; of apple trees that have been tagged and studied; and the A Power of Place Learning Experience and Research Network (APPLE R Net), a multi-institution research network directed by Corwin that introduces students to field research by involving them in a project examining apple trees across the Rocky Mountain region.

BATP also is part of the��,��which connects Colorado researchers with other apple-exploring groups and researchers across North America.

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Mia Williams (left) waters a newly planted apple tree Saturday morning. Williams, who will graduate this summer, is double majoring in ecology and evolutionary biology and environmental studies.

“This project has grown so much since our initial community engaged Apple Blitz in 2018,” says Dunbar-Wallis. “We've tagged over 1,000 trees and created a database, taught multiple course-based undergraduate research experiences at CU and at colleges across Colorado and northern New Mexico, started a data-collection app and interactive map in collaboration with CU computer science capstone students and installed a demonstration orchard in collaboration with Boulder Open Space and Mountain Parks.”

The demonstration orchard, planted two years ago, functions as a teaching and research laboratory to explore how biodiversity affects the functioning of apple orchards and their services to human well-being, including efficient water use, pollinator habitat and structural complexity supporting natural pest control.

A part of the narrative

The idea for the 30th Street orchard was revived by a group of six undergraduate and two graduate students almost two years ago, who proposed resubmitting a grant application that hadn’t been accepted in 2019.

“We’re a group who really love what we do and love apple trees and working with the soil,” says Katie Mikell, an ecology and evolutionary biology student who is graduating today and who was a member of the team that crafted and submitted the grant proposal.

“Before, (the orchard plot) was a lawn full of monoculture turf grass, so part of our argument was that if we put in an apple orchard, it would create a carbon sink (a system that absorbs more carbon than it releases), it would save the school money and anyone walking by could pick an apple. Plus, once the trees are producing, we can donate apples to the food pantry. Everyone can benefit from an apple orchard.”

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Deidre Jaeger (right, PhDEBio'22) and her sons Sage, 4 (left), and Cedar, 1 (center), plant apple trees at the 30th Street orchard Saturday morning. Jaeger was a postdoctoral researcher in the Department of Ecology and Evolutionary Biology and an advisor for the Center for Sustainable Landscapes and Communities and is a researcher with the Boulder Apple Tree Project.

Students prepared the 30th Street site during fall semester, working with departments and organizations across the university, as well as many community partners. The trees planted Saturday are about three years old and were obtained from Widespread Malus and Benevolence Orchard in Boulder.

“Our students are at the core of the university, and their passion and ingenuity are critical to our values around infusing sustainability throughout 91�Թ���. This orchard exemplifies that pursuit in so many ways,” says Vice Chancellor for Sustainability Andrew Mayock.

“It is not only helping to protect biodiversity in our community. It will help feed those in need on our campus and create a living-learning laboratory space where sustainability leaders of the future will learn and develop strategies for urban agriculture planning.”

Fifteen varieties of apples are represented in the orchard, including locally grown historic cultivars like Wolf River and Colorado Orange. A beloved apple tree on the Bobolink Trail is even represented in a newly planted graft.

“There’s so much learning that can happen in an orchard,” says Manuela Mejia, an ecology and evolutionary biology PhD student who will conduct her doctoral research, which will include studying insect diversity, at the orchard. “So many facets of science are represented here.”

In addition to trees, the orchard will include an understory of native, drought-tolerant grasses and pollinator-friendly wildflowers, notes Mia Williams, who is majoring in environmental studies and ecology and evolutionary biology and will graduate this summer.

“It’s really exciting that this orchard will become a part of the story of agriculture in this area,” Dunbar-Wallis says. “We’ve tagged more than 1,000 trees (through BATP) and some of them are a hundred years old, so you think about everything they’ve seen and been through, the history that they hold, their stories, and now these trees—which are little now and probably won’t produce fruit for two or three years—are part of that narrative.”

Sophie Small (left) and Amy Dunbar-Wallis (right) fill a wheelbarrow with compost Saturday morning to prepare for planting an apple orchard in front of the 30th Street greenhouse. Small, a freshman who is studying biomedical engineering, learned about the project through the CU Farm and Garden Club.��

Sophie Small (left), Isaac Kou (center) and Kyrie MacArthur dig a hole Saturday morning before planting an apple tree in it. Small is studying biomedical engineering, Kou just graduated with a major in computer science and a minor in ecology and evolutionary biology and MacArthur is studying history and education.

Amy Dunbar-Wallis (PhDEBio'25) digs a hole for a young apple tree Saturday morning.��

Amy Dunbar Wallis (left, black vest) educates student and community volunteers Saturday morning before they plant 30 apple trees in front of the 30th Street greenhouse.

The apple trees planted in the 30th Street orchard Saturday morning, one of which even bloomed, are three years old and should begin producing fruit in two or three years.

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