Costco and other retailers may be selling fewer Christmas trees this Holiday season. The American Christmas Tree Association told Fox Business the shortage is industry-wide."Costco, and all retailers, will be impacted by the reduced tree supply this season," ACTA said in a statement. "We anticipate that most retailers that typically sell both live and artificial trees will continue to do so, although they will have limited supply compared to past years."RELATED: Hottest toys to grab in 2021 and how much they costACTA said the reduced supply can be attributed to extreme weather events in the Pacific Northwest and Midwest and supply chain congestion brought by the COVID-19 pandemic."These challenges are real.