The Lightning Root works and doesn't work. In the new game I started for playing with the new expansion, the Lightning Root worked as the tooltip said, while in one of the new neighbourhoods. I then moved that same household to another world and planted a new one and no option to connect it to grid. I've tried having it outside, in a single planter, upright planter from Eco Living, in a multi planter - tried base game and all crafted versions with a total of four of them together, inside, outside, sheltered and not shultered and it just does not work in any world other than the new one and only the one household. I have NO CC, NO Mods and this was a new game from scratch when the expansion was first played which was the day of it's launch.
Edit: More info: All lots I tried growing the Lightnight Root on where "Off the Grid" and my gardening is now maxed, and got new seeds, tried everything again to see if level mattered and took the time to move to every single world available from base game and up, I have all expansions/game packs/stuff packs and most kits and no change. I also moved this same household back to the original lot I started on and now the Lightnight Root will not hook up to the grid.