Let's be real here. As I've said since the rework in season 6, Zyra's seed passive is inherently toxic and unsustainable. Reasons:
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It gives her far too much power relative to other champs at levels 1-6
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It's RNG. There's skill to playing with/around it, but it's still totally random whether you spawn seeds in a threatening or useless location.
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The passive seeds are the stated reason why plant health was nerfed, leading to many situations where they are 1-shot and unreliable.
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Plant damage is increased with Zyra's level, then multiplied by number of plants, number of attacks, and multiplied by 1.5 with her ult. The added plants from passive increase her theoretical damage ceiling by far too much.
The fact is that Zyra will never be fixed until this is addressed, and Riot has thus far refused to do so. Per usual, they keep the most toxic part of a kit and nerf all the way around it.
Playing as Zyra is not particularly enjoyable. You have to deal with layers of RNG and delays, and it's unbelievably frustrating to land a perfect combo only to have your plants melted in a fraction of a second. You can also be totally nullified in champ select because of bullshit coding that Riot is ok with (Corki, MF, Lucian, etc).
Playing against Zyra is also extremely miserable, and it's only made worse in champ select. Sivir's W deals 0 damage to plants while MF and Corki autos 1-shot them. Her early dps and zoning are absurd. And despite proper positioning there's always a chance that her passive will randomly fuck you over by spawning two seeds 100 units from you.
You've probably noticed that there are wildly different perceptions of Zyra amongst players, ranging from OP bullshit to total dumpster fire. Both are correct, and that's exactly why she's such a toxic nightmare. She's very similar to Illaoi and Katarina in the way she has exceptionally high damage capacity alongside exceptionally high counterplay. But unlike Kat, Zyra has to deal with RNG; and unlike Illaoi, Zyra's plants are easily killed by accident and aren't immune to damage during ult. When the stars align, it's absolute bullshit. When 5 plants spawn and die before your ult can cast, it's a total dumpster fire.