Zyra Plant's Targeting
So I recent started playing Zyra loving her whole plant system and all, and I understand for the most part how everything works except for her plants targeting system. I know that they will follow up on my auto attacks and they can't attack structures, but I can't seem to figure out who they attack if left alone or if my target is out of their range. Some times they attack creeps sometimes champs and they seem to me to swap targets every now and then before they get killed. I have had some embarrassing moments where I pop a spitter or stabber at long range to kill a champ and instead they start attack a nearby creep or monster. Just wondering if any one know how they choose targets.
Edit: Sorry if i did not make it clear this is not a buff or nerf request post, I just want to know how her plants prioritizes there targets beyond attack what you auto attack.