How many potatoes do I need, really? This year I decided to be proactive. I counted the number of weeks between now and the end of February, when the remaining potatoes become too sprouty to use. Then, I divided the potatoes up. Each bag holds two pounds of potatoes and is clearly marked with the variety. I have set aside my lot and the rest I can hand out to friends, my fellow potato grower and random passers-by.