Pine needle mulch is lightweight and acidic

https://pr.valleyjournals.com/article/Landscape-Supply-House-Grand-Opening-Lubbocks-New-Destination-for-Landscape-Professionals?storyId=67cafe02bb465f0008aa0d59

Pine needle mulch is lightweight and acidic, making it ideal for acid-loving plants like azaleas and blueberries while helping with moisture retention.