Sorry, I don’t have much time to elaborate, but I’m a naturalist, and also a volunteer cartographer for OpenStreetMap.
I find that these 2 projects, which I’m passionate about, are very complementary.
I’ve mapped some remarkable trees in OpenStreetMap from iNaturalist observations.
For example : https://www.openstreetmap.org/node/11043752460
I can only encourage naturalists to contribute to OpenStreetMap!
The community will be delighted to welcome them! 