I started on an iphone and they rolled in every 24 hours. On the ipad I've seen them only once and never again in days. A friend is having the same problem on an android tablet. Different programming? Any suggestions?
Yeti/pinata party appearance difference between the ipad and iPhone
plants-vs-zombies-2
Best Answer
From the official Plants vs. Zombies 2 FAQ:
Perhaps you are not connected to the internet all the time?