Update to my zombie problem...
After 3-4 sim days of zombies appearing every night, (and staying around all day), they are finally going away at dawn. However, I also have zombies appearing during daylight hours, as early as 9 AM. (These last until the following morning, or until they are shot down by my peashooters). However, I now have a fool-proof garden defense system in place! (Muahahahaha! :twisted: )
Most of the time the zombs can find nothing to do, so I regularly have 6-7 zombies walking around my lot.