Zyras plant AI changes will not be enough.
She still has glaring weaknesses (Her mobility, her high CDs, her lack of any defence, her mana costs) so please buff her strengths. And I don't know why you tried to give her knock up an extra .5 seconds of crowd control but that's not the direction she needs.
Her passive is garbage. A 300 damage situational rocket with a highly telegraphed wind up and tons of breathing space UPON Zyra's death, is not even worth a batt of an eye. Early game, you might be able to trade kills with it if you know you're screwed and want to flash towards your enemy. (Which teaches players to do exactly what they're not supposed to do as a mage) Late game, the damage is just unremarkable.
Give it missing health % execute damage Make it activatable immediately upon death and increase the speed. Make it so if Zyra kills someone with this ungodly awful skillshot she should be rewarded with a revive.