These are the steps:
- First open PvZ
- open Zombotany or Zombotany 2 minigame.
- pick the plants ( you can pick anything wihout sun producting plants, dont chose upgrade plant)
- return to the main menu
- open the userdata folder (Plants VS Zombies userdata)
- find a DAT file named game1_16 or game1_32
- Rename it into game1_17 or game_33 (before renaming if you notice there is alredy a game1_17 or game1_33 delete it)
- open the wall nut bowling
- the plants seem to be free, plant them. They even can be planted in one same square.
- wait for the zombies coming and plant your wall-nut ,Crush them.
Tested and worked!
If it not work leave a message to my talk Page.
Be Careful the PvZ sometime Eror when you edit a user data game file.