Anyone else think Zyra's W needs a once over?

The basic design of Rampant growth is actually pretty cool, and a lot of fun. I just wonder if I'm the only person that has issues with the secondary aspects of the power? W is ranked last, no questions and there isn't a situation in-game that has ever made me regret adding damage to my Q or E over making my seeds recharge 1s faster.

Added to that is the CDR passive. It's something that works on Ryze's Q because there's another reason to rank the power in addition to the CDR. With Rampant growth, you buy everything about the power with the first point, and CDR is the only reason to rank it. Your plants aren't any stronger at R5 over R1, so the only thing you buy with your skill point is 1s off the seed recharge and 2% CDR toward your cap. The CDR isn't even that valuable, as most people build CDR elsewhere because they cap W last meaning they don't benefit from the passive CDR for most of the game.

I'd really like to see Zyra's W improve her plants with rank. Give players an actual decision when it's time to choose what to rank. Removing the CDR passive, and replacing it with a boost to her plants with rank would be a massive improvement. I could see something like 3% additional AP scaling, +2 Health, and +1s duration per rank (R1 health would still be 6 so plant base health would have to be cut to 4). At max level her plants would have 35% AP scaling, 14 health, and a 15s duration. That would be something, I feel, would actually make people think about what they want to rank.

At ranks 2 and 5 plants would have a dramatic and obvious power spike where they'd be able to tank 2 and 3 turret shots each. R5 plants would deal more damage than R1, and they'd have the additional duration to make the most use out of their additional hitpoints and longevity.

That's just an example, but something really needs to be done with the power. It's super interesting gameplay, but it's sad that there isn't any dynamic improvement to the gameplay throughout a match.