This is the penultimate book in my project to read (or have read) all the titles on the New York Times 2021 list of the best books of the past 125 years. Like many of the books there, I don't know if it would be on my list of best books, but I liked it OK. For some reason, I'd mentally pigeonholed it as a sentimental book for non-adults.
I am pretty sure the titular "tree" refers to the young heroine, Francie Nolan. (Although there are some literal trees mentioned too, if you're of that bent.) At the turn of the twentieth century, she's born into a relatively poor family living in Williamsburg, then a slum area of (yes) Brooklyn. We get to know her as she grows into young womanhood. And her extended family, who are lovingly and colorfully described.
Along the way, there's plenty of color, humor, tragedy, drama, heartbreak, love, death, betrayal, … and even a little gunplay. It's kind of a soap opera, to be honest. But I enjoyed it quite a bit. Francie's an incredibly likeable character, and she remains a believable one as the book follows her over the years.
The 1943 novel was a massive best-seller, and became a 1945 movie. I haven't seen it, but it would be interesting to see how they handled some of the more, um, adult themes.
The remaining book on the list is Ulysses by James Joyce. That is gonna be a project in itself, I think.