Huge Ginkgo Tree

is a Tree that cannot be planted. It can only be obtained by starting the game with a Map Seed that contains a Huge Ginkgo Tree. Despite the tree trunk's appearance, the Huge Ginkgo Tree only occupies a single tile. 
It is a potent Wood element Qi Gathering plant, and is useful for making powerful early-game Cultivation Rooms. An item can be dropped and banned on top of the Huge Ginkgo Tree, allowing it to stack its Qi Gathering properties on top of any items in the array. 
When building a Cultivation Room around a Huge Ginkgo Tree, make sure to save the game before building, as it is easy to accidentally build something over the tree's single tile, which will result in the tree being chopped down inadvertently.
Once a Huge Ginkgo Tree has been cut down, it can leave behind its cut trunk if the tile is not built on. While the trunk description will still mention Gather Qi, it is a visual bug and it has lost its gather qi effect as shown below, with the Qi on tile displayed thanks to the mod MoreGridInfo.