Plant Food, that delicious and nutritious turbo-powered fertilizer, has a dramatic effect on the plant you feed it with. Try applying it to Sunflowers for a massive boost to your Sun currency, or to an offensive plant if you need to dish out some serious damage.
To get more of this powerful stuff, destroy any glowing zombies that you see, then touch the food itself to add it to your bank. You can also spend some of your hard-earned game coins on Plant Food if you've completely run out. Note that you can only hold three doses of Plant Food in the bank at any one time, unless you upgrade this bank limit.
As with the regular coin currency, Keys drop from zombies. It's much, much rarer to see them though, so keep your eyes peeled at all times. You can also find them in Yeti Zombie Lunchboxes, but you'll have to be quick to defeat the powerful Yeti - a fight that will likely drain some of your power-ups, so be careful.
Note that while you can replay levels to get more Keys, each world has its own specific set. You can't carry your Key stash from one world into the next.
Subscribe to Daily Browser Games News!