Just to throw this out there.
If you don't have another sim to transfer some of the stack to, you can always use your refrigerator. The same box comes up and you can split them. I do this to keep my perfect stuff in the frig and sell all the rest of my imperfect gardening stuff.
The cool thing is that you do not have to be anywhere near your refrigerator to do this. I split stacks from all over the place, especially when fishing real far off.
Just a FYI