Tree root collar excavation to suitable buried flares and decrease girdling roots which may compromise tree steadiness.

https://smb.oxfordeagle.com/article/JandJ-Treewackers-Issues-Summer-Tree-Service-Safety-Advisory/6a46e87a955bea00027f64c9

Tree root collar excavation to true buried flares and decrease girdling roots that could compromise tree stability.