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I've recognized this a few times in Texas. Trees were more or less "professionally" painted purple. It appeared totally random to me but was too frequent to just take it as a plain tag from the own...
#1: Attribution notice removed
by
System
·
2020-10-27T17:18:44Z (about 4 years ago)
Source: https://outdoors.stackexchange.com/q/13612 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/