Viewers

The episode was viewed by 4.23 million people, earning a 0.8/3 in the 18-49 rating demographics on the Nielson ratings scale, ranking second on its timeslot and fourth for the night in the 18-49 demographics, behind Dateline NBC, a rerun of Hawaii Five-0, and Shark Tank.^[1] This was a 5% increase in viewership from the previous episode, which was watched by 4.01 million viewers with a 0.8/3.^[2] This means that 0.8 percent of all households with televisions watched the episode, while 3 percent of all households watching television at that time watched it.

Critical reviews

"Tree People" received positive reviews. Les Chappell from The A.V. Club wrote, "'Tree People' is one of those Grimm episodes where the creative team puts its world building on hold and tosses its heroes into the unknown. While most conventional episodes have Nick learning about a new portion of the wesen world, installments like 'Volcanalis' or 'La Llorona' introduce an air of an even deeper mystery, creatures that not even his ancestors' journals or his wesen allies can fully explain. Rather than sabotaging the world-building, it helps keep the feeling that there's still uncharted territory in the world."^[3]

Kathleen Wiedel from TV Fanatic, gave a 3 star rating out of 5, stating: "Yeah, sure, the victims in Grimm Season 6 Episode 9 were all vile, nature-destroying malefactors, but what a way to go...! This story featured not one but two flora-related beings, the kinoshimobe and the people-eating tree. It's really sort of perplexing that this sort of thing hasn't come up before, actually."^[4]

Sara Netzley from EW gave the episode a "B+" rating and wrote, "All in all, this was a fun episode! In some ways, the villains were more sympathetic than their victims, which always produces interesting tension. Plus, Nick was able to contribute to the collected Grimm knowledge, and, as always, the chemistry between this excellent cast was off the charts. We also saw a bit of forward momentum on the ancient calendar/mirror demon story front, plus a pinch of love triangle angst, which I have to believe is setting us up for the final story lines still to come. Four more episodes, folks!"^[5]

TV.com, wrote, "So overall, 'Tree People' was a decent episode. But like most of this season's 'final chapter' it seemed oddly placed. It would have been an above-average episode in any other season. But as fifth from the end of the series, it's just in a weird place. It's same-old same-old, in a finale season where the creative team had the chance to give us a lot more."^[6]

Christine Horton of Den of Geek wrote, "Overall, this was a solid episode that brought out the show's sense of fun, while providing some solid creepy moments in the forest. We're none the wiser about any of the bigger themes at work (has Black Claw now disappeared entirely, despite claiming it was out for a revenge a few weeks ago?) so this indicates the last few episodes will really have to ramp up the action to give us the finale the show deserves."^[7]