The following list shows you the most profitable crops for a particular length of time. Depending on your game level, some of these crops may not be currently available to you, so use whatever you can at the moment for maximum profit.
All of the crops' profits are calculated by subtracting the cost of seed and plowing from the sale value, and then that's divided by the number of hours it takes to mature. That lets us know how much money we're making on a crop per hour.
Example: It's better to make 2.5 cents profit on a strawberry acre every hour than 65 cents profit on one wheat crop every three days, because the strawberries will net 180 cents in three days, versus only 65 cents in three days on the wheat.
The only reason why you would want to plant the wheat versus the strawberries is if you are going away for a long weekend and won't be able to harvest for three days. At which point, a 50 cent harvest is better than no harvest at all.
2 hours - 5.5 cents/hr raspberries
4 hours - 6.5 blueberries; 2.5 strawberries
6 hours - 3.3 aloe vera
8 hours - 7.25 tomatoes; 2.875 pumpkins
12 hours - 6.25 carrots; 3 rice
16 hours - 6.75 coffee
1 day - 6.875 sunflowers; 3.208 peppers; 1.375 soybeans
2 days - 4.5 yellow bell peppers; 2.75 pineapples; 1.375 squash; 1 eggplant
3 days - 2.986 corn; 2.708 potatoes; 1.625 cotton; 0.903 wheat
4 days - 2.27 watermelons; 1.24 artichokes
I have not obtained complete access to all of the crops yet, so I will amend this list as I level up and find ever-more profitable crops (for the curious, I am currently at Level 25).
