Plant of the week is useless

ehh.... I think this might have been a PopCap Devs' joke, players with the plant can earn the seeds for a plant which cannot be leveled up....  this might have been a new strategy to make players without the plant to envy and spend $$$ to buy the plant.  👿 

they are making an NPN(new plant nursery) of each plant, so i think they just made one of the imitator for no reason.