So I just got the castle settlement and I instantly started improving it, I placed down lots of crops and stuff, got bored and did lots of other quests and then came back to continue improving. Once done I then decided to assign settlers to things, only to find out that none of them could work the crops. I then found out that in the workshop, I can't even take them down.

I would appreciate it if anyone knew how to fix this since they are just taking up building space for other things.

happened to me a sanctuary atleast 50% of crops unselectable or assignable

for me fast traveling away and back fixed it

try that, hopefully it works for you too

Crops can and will die if left unattended. Some of them will never be selectable in or out of workshop mode. There is a known bug with this. Hopefully the above advice to FT away and back will help you - although I have found that there are still times when crops become like static objects, useless. If you are on a PC, you can use the console to disable them and then markfordelete. Otherwise, you're stuck with them for the duration of the game.

It's best to assign crops as you plant them. You can assign 12 crops (except Mutfruit, which is 6) to a single settler. I tend to plant 12/6 then assign them to a settler immediately. You don't have to assign each one individually, but can assign the first plant in a row and the game will automatically assign all it can to that settler. This takes a few seconds. You can watch the number of food increase in workshop mode and will get the pop up message that the resource has been assigned. If you plant and have more than the 12/6 unassigned crops at the time you assign a settler, the game seems to randomly assign those crops. This can lead to difficulties knowing which crops have been assigned and which haven't. Also, if your crops get destroyed during an attack, they can lose their assignments, even after you repair them. This again can (and does) lead to crop death. I have, more than a few times, had to store every plant (that wasn't dead) in the warehouse, clear the dead plants, and then re-plant the stored ones and re-assign them to get every crop assigned peoperly. If I did not do it this way, every time I assigned an un-assigned crop to a settler, a different assigned crop would lose it's assignment. It become another nightmare to keep track of. Hopefully this will be fixed by Beth or a user mod at some point.

I found that having an equal number of crops to water ensures all crops grow with a settler assigned. For example if you have 50 food, have 50 water.

Not sure if it's the same issue, but sometimes I can't select a plant (to move it or just pick the fruits). But it's just the bounding box or whatever is used to select it that's apparently messed up, and it's actually possible to target it but you have to look around, sometimes a couple feet away from the plant. I wonder if it doesn't happen when you place it, as if rotating and moving it around (holding E on PC) was messing the bounding box. Anyway when I finally manage to target it, I store then plant it back without moving it around.

Ok, I managed to fix it. I placed new crops to assign but I wondered why only one of them was being worked, I then looked at the person so it highlighted the crops that they were harvesting and some of the other crops were highlighted too. I can access them again now so, problem solved