I'm not sure why, but right now some of my food isn't growing in my settlement. Old food is growing fine but when I planted a ton of new food, they won't grow. And i can't remove them either. It seems the game only lets you remove the plants after the food has actually grown on them.
Currently I'm just using other settlements to collect the food I want, but it's just a slight annoyance. Is there perhaps a limit to how much food you can grow that I'm not aware of?
I'll come back after a little while and old plants will have food on them while the newer plants are still like I had just placed them.
Note I don't believe it's a matter of "not waiting long enough." It's been quite a while, in game time, since I placed them. No new food has been growing anything.