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"I calculated a growth rate chart that sort of looks like Groot, given the few data points that we have for Groot's height and age, so I calculated a polynomial function that would fit with the data we have," North says, explaining that arborists typically use power functions or exponential functions to explain tree growth rates, since they're non-linear. (This Groot is often called "Teen Groot," but James Gunn has said that Groot is an adolescent, more akin to a 12-year-old than a teenager). 2, and Groot stands a slender 5 feet, 4 inches tall.

Infinity War takes place roughly four years after Vol. 2, which is set two months later, Baby Groot is 10 inches tall. When Rocket plants one of Groot's twigs at the end of the first Guardians, the little guy looks to be about 6 inches tall.

2, North presumes Groot must have stoma, the structures on the underside of leaves that absorb carbon, and he might use radiation from space rather than sunlight for energy. Real trees use energy from photosynthesis to absorb carbon from the atmosphere, and that carbon becomes their physical "body." Given that we don't see Groot eat anything but one of his own leaves in the first Guardians of the Galaxy, and some candy in Vol. "It's difficult to imagine what Groot is actually growing off of, assuming he has a carbon-based, wood-like structure." "There are a few confusing things about Groot," admits Eric North, an assistant professor of practice at University of Nebraska-Lincoln's School of Natural Resources who specializes in urban and community forestry. In fact, based on how tall Groot has been in his three Marvel Cinematic Universe appearances, we can pretty accurately determine his growth rate, though there are still some questions. Yes, one avenging arborist tells SYFY WIRE. If Groot hadn't been turned into fertilizer at the end of Infinity War, how much taller would he be in Endgame? Regardless of how much of a time jump there is between the two Avengers films, would Teen Groot have another growth spurt in the real-life year gap between the movies?
