Great job for a first time entry! I'm not sure if I've seen a faction that has a more important piece than "if it dies, you lose". Root is made for these kinds of wild ideas! Balancing will be tricky, but good luck!
Is there a name for the "source" tokens (waterbell, truffle, and Wisteria) to distinguish them from the "resource" tokens (water, nutrients, and light)? I found it a little difficult to keep the two types of tokens separate in my mind. I assume that you need to be at one of these "source" tokens to Harvest the corresponding resource, but the current wording of the action makes it seem like I could put any resource in a matching clearing with a Sacred Wood warrior.
Also, if you wanted to reduce the number of tokens in play, you could probably get rid of the "unidentified" tokens and just put the image on the back of a "source" token. Then the player would just flip to token over when the Botanists discovered what was there? I assume you were going for something like the Ruins tokens, which definitely works, but I tend to find the assignment of Items in Ruins to be a bit clunky.