Don't plant quick growing crops and think you can come back a couple days later and reap the rewards. If you don't harvest the crop in time, it will die and you'll be stuck with having to clean up the mess, not getting any rewards. The time it takes for a crop to die is the same it takes for it to fully grow. For example, if the crop takes one day to grow, you have another day on top of that to harvest it before it dies.
But there's more to Farmville than just crops. There's also animals and trees. These are very different compared to crops because not only can you move them around your farm after getting them, they never expire once they're ready to harvest. You could have a whole forest of banana trees ready to harvest and they would never go bad. Now the rewards for harvesting trees and animals isn't as high as crops, but it's much less work and they take up a lot less space.
A good idea is to visit your neighbors' farms every day. When you visit their farms, Farmville will ask if you want to help them out with a random task. Always say yes because you get a nice reward for helping and this can really provide a nice reward in the long run, especially if you're just starting out.
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