Your native fruit trees may sometimes grow a 'perfect fruit'. This fruit looks different from the others and is worth more. You can plant a perfect fruit to create a perfect fruit tree, but this tree will die after a few harvests. Perfect fruits sell for a higher price in a town where the fruits are not native, making them an excellent way to earn more bells. This page explains the details of perfect fruits.
Your native fruit is whichever fruit was growing on your trees when you first created your town. If you don't remember, try selling an apple, pear, peach, orange, and cherry in your town. Whichever one sells for the lowest price is your native fruit.
In your town, perfect fruits can only grow on trees of your native fruit type. Therefore, you should plant a lot of native fruit trees and harvest them regularly. If you are lucky, one of them will have a perfect fruit on it. The perfect fruit will look different from the others. Perfect apples have speckles, perfect oranges have a bump on top, perfect peaches and perfect pears are golden in color, and perfect cherries are golden on the bottom.
Please note that only apples, pears, peaches, cherries, and oranges can be perfect. You CAN'T have perfect lemons, perfect persimmons, perfect durians, perfect lychees, perfect coconuts, or perfect bananas.
If you plant a perfect fruit in a town where it's the native fruit type, the resulting tree will have only perfect fruits on it. However, if you plant a perfect fruit in a town where it is NOT native (e.g. plant a perfect peach in a town where oranges are native), it will NOT create a perfect fruit tree. Instead, it turns into a normal fruit tree.
Perfect fruit trees take three days to grow to full size, just like regular trees.
You can shake perfect fruit trees to harvest the fruits as usual. However, after you harvest the perfect fruits several times, the tree will die, and one of the fruits will be rotten.
Warning! Be careful not to try selling the rotten fruit! If you try selling a rotten fruit, not only will Reese make you pay her to dispose of it, but she won't give you any money for anything else you sell at the same time! Try to find a trash can furniture item for your house so you can simply throw the rotten fruit away.
After a perfect fruit tree dies, it won't produce fruit anymore. You will need to chop it down and plant a new perfect fruit to make a new perfect fruit tree grow. Each tree gives at least four harvests and at most seven before it dies.
Important! Be sure to save some perfect fruits so you don't run out of them when the perfect fruit trees die! I recommend planting a new perfect fruit tree as soon as an old perfect fruit tree dies.
Your native perfect fruits are pretty valuable in your own town (worth 600 bells), but they are five times more valuable in towns where it's not the native type of fruit (3000 bells). Therefore, to make a lot of bells from perfect fruits, take them to a town where they are not the native type of fruit and sell them there.