As stated in the title. If an Eyeplant is too close to an Eyeplant or Lureplant that it does NOT belong to and is not "siblings" with, it will attack it.
Seems a little weird that they'd avoid Wormwood but not themselves.
Might be intentional but I've heard no mention of it.
Plant multiple Lureplants near each other, on ground where Eyeplants can spawn (grass or turfless tiles)
When they start producing Eyeplants, the Eyeplants will fight each other and, with the right positioning, kill the other Lureplants.