Also gardener zombies are the spawn of Satan. The fact that the only way to deal with their poison attack is a plant that's purchased from the shop is just plain evil.
Yes, you're right, I was planning to add a new plant to the shop so I can move healer shroom to adventure more, but I haven't had much time.
However, gardener zombies aren't much of a deal, they need 2 shoots to kill a common plant and healer shrooms aren't that really useful.
Not sure what I'm doing wrong then since they regularly set me back loads. I guess I just am not optimizing for DPS as much as the game wants?