So when do you nerf Zyra?
I've seen supports that sometimes do the most damage in a team, it happens, but only Zyra does it every game.
Her zoning is the best I've seen in a game, she is also super safe, her plants have huge range, not to mention she can place them from a great range as well, they do decent damage for the low cooldown and the low mana cost they have. You think Lux is safe? At least she has to trade damage for that safety, you don't nearly do enough damage with just her E, which can be dodged or missed, but Zyra, she can outdamage Lux with those plants that have no counterplay, and she is a support lol.
And by the way, I've just had the pleasure to play against one on mid in a ranked game, and aside from boosting her damage and zoning, her wave clear is off the charts. She puts a plant in your wave and it clears all of your minions, while she is free to move to another lane at the same time. I played Xerath and I had to stay in lane and kill her minions, I couldn't just move about and let my plants do all the work for me. I was unable to roam, and if I tried she would be waiting for me in a bush because she has all the time in the world to set up. Yeah I killed her first, I was 3/1 and she was 0/1/1 or something, and ever since then she didn't die a single time, she reached 3/1/10, and the player had nothing to do with it, the champion is just absurdly safe and can still remain useful. The mage update was a huge disappointment. Zyra didn't need to become this op, Annie didn't need to become even more op, we all remember how bad Malzahar was right after the update and even now he is banned quite a lot, Anivia is retarded as soon as she gets 6 because she no longer needs her Q to burst you down and I don't remember what other champions became retarded after the Mage Update. Kudos for the Xerath update though, the bonus ultimate barrages feel good.
The plant ranges need to be reduced, clearing them is out of the option right now, and also, make the plants not send a bolt the instant they appear straight towards you.
