Walkthrough: Once you reach the top of the beanstalk and come to the Forest Charging Station, ground-pound the empty section of field in the corner to receive another Power Moon. From there, head the opposite way down into the garden that actually overlooks your airship below. There will be Goombas found throughout this area, so be prepared to defeat many of them. On the left side of the area will be a small crawl space, the same Mario can crouch down in to reach more Purple Coins. You can also capture and stack the Goombas in order to reach Goombette, the same that will provide you with another Power Moon.
The passageway above all the Goombas will lead to yet another field, on full of Sherms and breakable blocks. Begin here by ducking around the ledge the overlooks the forest, jumping on the red beams to find more Purple Coins. After that, use Cappy to take over a Sherm and blast away the remaining enemies. From there, start blasting away all of the brown blocks that you find, including the ones against the wall. You should be able to blast open a path that you will be able to climb up the side of, breaking all of the blocks on the top left after you do in order to find a hidden Power Moon.