Zyra W Passive Idea

This was just a thought to try and let Zyra back into the midlane as many Zyra mains want. While her new passive for her W is good, allowing her to be a decent jungler, what she really needs is some form of sustain/defensive capabilities. All mid laners have some way of keeping them alive, Zed along with many other assassins have blinks and/or dashes, while others, such as Lux, can produce shields for themselves or even heal themselves. Zyra lacks any of these.

My idea for a new, more effective W passive for Zyra is that whenever a plant dies or is killed, she would be healed for a small amount. This passive would only effect plants killed that were produced by her W seeds. For example, if she turns a seed that was produced from her passive into a plant, and that plant dies, she would gain nothing, but if the plant was made from a seed produced from her W, then she would be healed for a small amount. The amount she heals for would be very small, like 8 health, which would be increased by a small amount per champion level. The reason for having it increase per champion level rather than ability level is that if Zyra players did invest points into her W, they would have to give up putting point into their Q or E early game, which would sacrifice a lot of damage which in turn wouldn't even make the W passive worth it.

This was just an idea, please let me know in the comments how you feel about it or if you have any good ideas on how to help bring Zyra to the mid lane.