The plantoids were created by accident by an unnamed alchemist, who will likely forever remain as such, for he doesn't recall his name anymore, but for simplicity's sake he calls himself Nokko.
Nokko became the first of the plantoids and through this simple fact or by happenstance, he remains one of the scant few lucid plantoids. A nearly immortal being who has lived for centuries in one shape or another, each time he grows anew he recalls fragments of the former life. Sometimes this information isn't much to go by, since the plantoids can live such short lives that they end within a decade, while some plantoids go on to live for centuries, a well known example of such plantoid being the Sun King. Nokko and the Sun King have differing views on the future of the plantoids. The Sun King wishes to keep the civilized races separate from the plantoids and that the forests are the plantoid's domain. Nokko on the other hand believes that the plantoids can intermingle with the civilized races if more plantoids can be somehow raised with lucidity similar to that of the Sun King and Nokko.
Nokko's aforementioned capability to recall his former lives stems from the capability of the plantoids to regrow themselves through fertilizing flowers with their own pollen. The first such instance happened shortly after Nokko's own personal transformation, wherein he was assassinated and his workshop torched by a group of adventurers. Other plantoids likely carry fragments of their former lives too, but lack the lucidity to communicate them, Nokko oftentimes laments how dull the company of most other plantoids tends to be, they lead simple and monotonous lives, regardless of who they used to be. But Nokko's desire to create and discover remained intact even after he became a plantoid.
"If you care to try, I can try you into a plantoid too. I think I might have the lucidity aspect figured out, it might just be a simple case of being alert when it happens and not resisting it. Though I understand if you wish not to go through with it, we all are rather attached to our physical forms. However, change need not be something we are afraid of. Sometimes change is good, albeit frightening."