To get the most money from your farm you want to not always plant the most expensive seed you can. The seeds that give the largest amount of cash are listed in the “Crop that yield more money” label. The higher the level you are, the better crops you can plant. So find the highest seed you can plant on the list and that will be your best money maker! You should also be sensible. If you know you are going out don’t pick the seed that will make the most money and will be harvest-able an hour before the predicted time you get home – Pick one that is slightly over your estimated time so nothing does go wrong!
Some seeds like Peppers, and Rice and Pumpkins are the best profit for the time they are planted (Best money per day) Also – To get an extra boost in money, Refer to the “Assisting” section
Finally, the Achievements (See section) gives great Money!
Peas are now the best thing to plant. Harvesting in 1 Day and making a profit of 176 Coins Each. (70,400 Coins for a 20*20 Farm!)