This is a good strategy to use specifically for PvZ Adventures but not other Tower Defense game. Why? It is because PvZ is different from other Tower Defense game in the aspect that the Zombies will eat the Plants whereas in other TD games, the towers are supposedly to be invulnerable and unreachable.
Plants vs Zombies Adventures strategy: place plants near adjacent path to avoid being eaten
Owing to the special gameplay phenomenon in this game that the Plants are vulnerable, putting plants near adjacent path to avoid being eaten by the Zombies is a good strategy to use. If you put your Plants on the beginning partion of the Path, they are easily reached by Zombies, but if you put them further back and the portion of the path is built purposely near the beginning portion of the Path, you can shoot the Zombies from afar and they cannot harm your Plants at all!