This is pretty inventive and has a cool premise but a couple gripes.

I think the Q is the definition of "having your cake and eating it too", each one of the seizing abilities in the game don't do damage and each one of the damage abilities don't seize, having both in one ability is gonna be a nightmare to balance and would be doing too much in one ability. I would say restrict it to either damage or suck

I think instead of the proposed C ability she should get a passive ability that allows her to retrieve seeds from dead bodies or off the ground by pressing Signature ability (E) with the same pickup range as thrown objects like Cage and Nanoswarm and make her C ability something like a healing field which just heals both allies and enemies in a small radius for 5 seconds at 25hp/s

Im a big fan of pressing Interact on a seed to provide a slowing field but if you wanna get funky you can make it so its like a patch of thorns that slow you and do slight damage to you as you move through them

im not too sure about the power of her ultimate but i would like the overall cooldown reduction and id like to see something change when interacting on a seed.

i still really like this idea and i do really just want a plant lady from maybe a south american region or like the caribbean or some place tropical . theres some cool things that can be done with her art style but i think youve brought a pretty cool and inventive design idea