system
Given the following post, respond as if you're commenting on Reddit:
human
[Avatar/The Legend of Korra]Why do most Bloodbenders need the full moon to bloodbend while bending the water inside plants is fairly easy?
gpt
The moon amplifies the abilities of Waterbenders, allowing even the most novice of waterbenders to do amazing feats, and allowing masters to do things never before thought possible. 

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Every living thing has Chi(Or chakras, if you're going by the Western Air Nomad terminology) and the more complex the organism, the more Chi they have, which offers a natural resistance to the interference of other's energy reaching inside them and disrupting the flow of things. 

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Plants have nearly no complexity or Chi (if any) and thus can be reached into and manipulated easily.