this is something i truly believe in and i dont think many people think about it when preparing Bob's. In most cases our bobs are simply meant to get us from point a to point b and at point b we would have our cache of supplies. I personally believe we should also think about what would we do if we couldnt get to point b as quick as we planned yet will need some sort of food to tide us over for the duration we are out there. Food itself isnt convenient to carry for lengthy spells but seeds sure are and many can be sprouted in just a couple days and within a couple weeks time one could be eating other fast growing crops.
I would suggest sprouting seeds whether its beans(any dry bean will sprout ) or alfalfa, radishes etc. They all contain good quantities of nutrients. Many of which are also fast growers like radishes, lettuce,kale , turnips, spinach etc. They are light weight, dont take up much space and could prove to be life savers in a bad situation. If one is worried about the season in which they may have to bug out in and try to grow a small crop of anything take along a small piece of clear plastic so that you can improvise and make a mini greenhouse .It is amazing what one can grow in mid winter via very simple means
For a rotational schedule for the seeds in the bag i would go with one year for a switch out. If the S doesnt htf in that time period throw them in your regular garden and restock the bag. Dont just toss them out...
Another idea along the same line is for if you have a planned BOL and know your most likely route to go about getting there. Plant some things in various places and keep small cache locations buried along your planned path. If you never use them they become a future generations archeological find

and if you do need them they could be your saving grace.