The green is probably so they can cgi the beanstalk into it. Actually that green center is making me think the beanstalk is dead on. That’s brilliant. I haven’t heard of it anywhere else and makes a lot of sense.
On the other hand, it coud be the after-effects of a vortex. In “The Return”, the ground in the forrest was a big hole after the vortex closed up. So this could be the end result of another vortex.
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Keeper of Rumplestiltskin's and Neal's spears and war paint and crystal ball.