Keep in mind that the more stuff you have on top of plots the slower you farm will load and may corrupt.
1. Set your farm to default
2. Hide all trees/flowers/buildings
3. Hit the PLAY button
4.When you farm reloads Plow 1 plot
5. Delete that plot (this activates your plow)
6. Plow all the plots you want for that farm
7. Save changes
8. Open that farm again - you should see your trees/flowers on top of your plowed fields.
If you are overlapping that farm - you will need to take each tab off line - make sure yours trees/flowers are hidden - plow 1 plot and delete for each tab.
Adding a video to watch -it is one of the free gift links - good luck