Sweet potato (Ipomoea batatas) production in the northern United States is limited due to the perceived barriers of a short growing season and relatively cool summer temperatures, yet recent studies have shown yield in northern regions can be greater than the national average when sweet potatoes are grown with plastic mulch. A study, now published in HortTechnology, was conducted in northwest Washington to evaluate the productivity of "Covington" sweet potato with polyethylene (PE) and soil-biodegradable (BDM) mulches and different in-row spacings (20, 30, and 38 cm) in 2019.