Ok... Its not a lot of description but I watched this movie when I was younger its 80's or early 90's movie and its about witches and all I Remember was that the (bad) witches planted this boy into a plant so like he was growing with the plant and I think his blood or something like that was green... I can't remember anything else... maybe the witches blood was green I don't know if that helps or what

Maybe it's "The Craft"

It's not "The Craft" because they don't have any little boys in that movie, but it was definitely a good guess!

I think this movie is older than that