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Carnegie Mellon engineers develop machine that visually inspects and sorts strawberry plants

Researchers at Carnegie Mellon University's National Robotics Engineering Center (NREC) have developed a plant-sorting machine that uses computer vision and machine learning to inspect and grade harvested strawberry plants and then mechanically sort them by quality — tasks that until now could only be done manually.

In a successful field test this fall, the machine classified and sorted harvested plants more consistently and faster than workers could, with a comparable error rate.

"We're looking forward to using the system," said Liz Ponce, CEO of Lassen Canyon Nursery in Redding, Calif., one of five strawberry plant producers sponsoring the NREC project. "All of our stakeholders feel that it has a lot of potential." The other sponsors are Driscoll Nursery Associates; Nor Cal Nursery, Inc.; Plant Sciences, Inc.; and Crown Nursery LLC. Together, the five producers represent about 85 percent of the California strawberry plant nursery market.

To maintain good strawberry yields, commercial berry growers must replace their plants every year. During the fall harvest season, strawberry plant nursery farms use manual labor to sort several hundred million strawberry plants into good and bad categories — a tedious and costly process.

The strawberry plant sorter uses computer vision to examine harvested plants that pass by on a conveyor belt. The sorter's novel machine learning algorithms allow it to be taught how to classify strawberry plants of different sizes, varieties and stages of growth, beyond the simple classification of good and bad plants. This introduces dramatic new efficiencies for strawberry nursery farms, helping them improve quality, streamline production and deliver better strawberry plants to berry growers, which in turn produces better strawberries for consumers.

"The sorter can adapt to plants that vary from year to year, or even within the same growing season," said Christopher Fromme, the project's manager and lead engineer. "It's very flexible."

During a 10-day field test in October, NREC engineers tested the strawberry plant sorter under realistic conditions, where rain and frost change plants' appearance, and roots may contain mud and debris. The prototype system had to sort plants of different varieties and levels of maturity. While in the field, it sorted more than 75,000 strawberry plants. On average, it sorted 5,000 plants per hour, several times faster than human sorting. The NREC hopes to achieve sorting rates of 20,000-30,000 plants per hour with the final system. While the sorter's overall error rate was close to that of human workers, it inspected and sorted plants more consistently.

"That's the beauty of it," Ponce said. "Hand sorting varies more and has more drift in quality." The successful field trial concludes phase two of a five-phase program that will develop a machine ready for commercial operations. Phase three will develop better methods to separate harvested strawberry plants for inspection, improve the sorter's robustness and ease of use, and integrate it into the nurseries' harvesting and packaging processes.

For more information about the strawberry plant sorter, visit the NREC's Web site at The NREC, part of the Robotics Institute in the Carnegie Mellon School of Computer Science, works closely with industry and government clients to develop and mature robotic technologies from concept to commercialization.

About Carnegie Mellon: Carnegie Mellon ( is a private, internationally ranked research university with programs in areas ranging from science, technology and business, to public policy, the humanities and the fine arts. More than 11,000 students in the university's seven schools and colleges benefit from a small student-to-faculty ratio and an education characterized by its focus on creating and implementing solutions for real problems, interdisciplinary collaboration and innovation. A global university, Carnegie Mellon's main campus in the United States is in Pittsburgh, Pa. It has campuses in California's Silicon Valley and Qatar, and programs in Asia, Australia and Europe. The university is in the midst of a $1 billion fundraising campaign, titled "Inspire Innovation: The Campaign for Carnegie Mellon University," which aims to build its endowment, support faculty, students and innovative research, and enhance the physical campus with equipment and facility improvements.

Lassen Canyon Nurseries is California's largest producer of strawberry plants for commercial growers and home gardeners. It has over 1,000 acres of strawberry plants under cultivation in California, plus nursery operations in Mexico and Asia. Its headquarters are in Redding, Calif.

Driscoll Nursery Associates is the world's leading grower of fresh strawberries, blueberries, blackberries and raspberries. It is the preferred berry partner of America's leading culinary authorities, including the Culinary Institute of America. Its headquarters are in Watsonville, Calif.

Nor Cal Nursery, Inc. is a state certified nursery that produces strawberry, raspberry and blackberry plants for domestic and international sales. Its headquarters are in Red Bluff, Calif.

Plant Sciences, Inc. is committed to research and development in plant breeding, plant tissue culture, seed production, crop growing techniques and pest management. Its headquarters are in Watsonville, Calif.

Crown Nursery, LLC produces strawberry plants for commercial growers. Its headquarters are in Red Bluff, Calif.

Byron Spice | EurekAlert!
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