For saving seed, I take a ziploc and write the name on a piece of paper to go in with the seeds.... thinking of eventually adding on other info, germination times, pictures, etc....
For growing, I draw out the starting tray or the raised beds and write the name in the spot as I sow the seeds or make the transplant....
I haven't gotten around to doing multiple transplants and pots yet.... my first season I had about 10 plants in containers and by the time transplants into bigger pots were finished, they were visibly identifiable....