In my current household I have 8 perfect UFO plants that yield between $9600 and APX. $19000 about every 3 days. If my Sim weeds them everyday and the plants have fertilizer they do better I my Sim gets the higher amount. My Sim can let the plants go about 3 days because they do not need water and get the lower amount. I have never had any problems with grafting. I do not use mods.
Where is the plant you are grafting? Put in on the ground and if it's to close to the edge of the property I run into problems planting but it might be the same for grafting. Dragon fruit has to have one space from other plants.
Some plants need more room. Some fruit trees are the same way. If they are to close they will get moved to the household inventory.
