I'm growing the French grapes and Chinese fruits at home without problems. I bought the fruit at the stores and planted it.
This is only for the ones spawned by buying them in buy mode with "buydebug" on.
You should be able to spawn the seeds with control+shift clicking on the ground and plant them that way too. You'd need something (like Awesomemod) that enabled that kind of interaction, though.ETA: Actually, never mind, you can't spawn seeds that way. You can spawn rocks, gems, metals, and insects that way, but not seeds.