This problem has confused and confounded many players for a long time, but here's the easy way to do it.
Clear the harvested fields from the farm so that you are back to green area. Plant trees, either gifted ones or purchase apple/orange trees for the purpose. If you are short of coins, visit our Gift Links site, and grab as many trees as you need. Plant them where you want them. You can either plant them with one row between each line or tight together, depending on how you intend to harvest them. Depending on the tree you use, you will have a crop every 2 – 5 days.
The harvests are at no further cost to you, and it's money all the way! If you get the trees from gifts, then they even come to you free. Not a bad way to earn extra coins! But, you can't plant anything now, the trees are covering the area! Now you need some help from my box of tricks!
Hide the trees using the wrench tool. Refresh the game with the Play. Take the plow and plow one field somewhere on the farm, away from the trees you just planted. If you already have plowed or harvested fields elswhere on the farm, you can skip this step. Now take the delete tool and delete that field you just plowed or a plowed or harvested field somewhere on the farm! Why do this? It unlocks the plow! Now take the plow up again and start plowing. All of a sudden, the plow works everywhere! You can plow fields anywhere on the farm now, not just over the trees you planted, but over anything that's hidden when you refresh. Turn the trees back on, they are all over the plowed fields. To plant, harvest or plow in future, just hide the trees and refresh.
The process is exactly the same for flowers. Hide the trees first and refresh, plow and delete as before, but rather than take the plow up again, start planting flowers. Once again, these can be found on the gift links sites, or by friends gifting them to you, so you don't always have to buy them. All flowers take 4 days to mature, and can be harvested every 4 days. They hold a reasonable price at the market too. When you finish the flowers, just hide them, refresh and plow delete again, then plow away, over both trees and flowers! The farm has now increased it's yield and income very easily, and with minimal cost.
