Answer: What a fun experiment! I suppose it is possible your potato could make little potatoes in the pot eventually if you can manage to keep it growing vigorously for long enough -- usually these plants need full sun to grow well -- but it is possible to grow potatoes in containers, although very large ones. When the weather moderates you could try transplanting it in the garden and see what happens. Your onion will most likely go to seed, meaning it will bloom and form seeds as would any mature onion and so is probably not worth setting out. Enjoy!
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