Maybe things are different here in PA but I get smaller potatoes when the plants get less water and I have read that they need water especially after they flower because that is when the tubers really get growing. I grow mainly Kennebec so maybe variety plays a role too.
I also get bigger potatoes when I plant the seed potatoes farther apart. I like the baking sized potatoes so I plant almost a foot apart. When I plant them closer I get lots of small round ones and a few big ones.
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