Hi, I am glad you got it working. From reading your comments, I think you might be confused on growth states... the gathering node is harvestable when it is in a growth stage with its "mature" flag set to true. You can also turn its growth stage "expired" flag to true, which controls which items are received when harvested.
This is meant to emulate a crop that is harvestable when fully grown and after it dies, for example if you wanted a Berry Bush gathering node to give Berries when the bush is fully grown and healthy, but if the player waits too long and the bush dies (and changes to a growth stage that is set to expired) they could instead get Moldy Berry or some other waste product.