| Towering Wisdom|
Grow the Tree of Wisdom to 100 feet.
Towering Wisdom is an achievement unlockable on PC, Steam, Xbox Live Arcade, PlayStation Network, and DS version of Plants vs. Zombies. To get it, the player must grow the Tree of Wisdom to at least 100 feet tall. The Tree of Wisdom starts at one foot tall and Crazy Dave will give the player five free bags of Tree Food after buying the Tree of Wisdom. The additional 94 bags of Tree Food needed to grow the Tree of Wisdom to 100 feet cost $245,000 altogether.
Ways to raise money
- See Money Guide for more ways to raise money.
- The player might need to make money fast by playing Survival: Endless or by doing some Gold Farming in Last Stand.
- Hanging around a full Zen Garden is another good way for the player to rack up money fast.
- Finding and killing the Zombie Yeti is not a bad idea at all. 
- If he or she is willing to hack, the player can use Cheat Engine for a money hack. For the guide for doing so, see Hacking Guide.
- The player could play some mini-games (especially Wall-nut Bowling 2) or I, Zombie to earn money. They get five Gold Coins every time they win.