Answer: Usually when the tops of potato plants flower it indicates that the tubers are beginning to form. After flowering is the time you can harvest 'new' potatoes. The longer the plants are alive, the larger the tubers will become. Normally when the tops yellow and die, the tubers are mature. It doesn't sound as though your potatoes went through the entire process, but there's not much you can do at this point except harvest what's there. When you plant potatoes, use certified disease-free stock, and keep the plants watered well. Hopefully you'll avoid problems next year.
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