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Perhaps you need to give the

Perhaps you need to give the plants more time? Sometimes the potatoes won't start to form until a week or so after the plant begins to bloom, or just when the flowers start to fade. Some potato plants may never flower. So for new potatoes, start looking for these as the plants flower and a week or so after. For mature potatoes, harvest after the plants die back--even waiting a week or two after that.

 

Also, if you give the plant too much nitrogen, it will focus on growing foliage and you won't get potatoes. Use a balanced fertilizer instead.

 

Potatoes don't like the soil to be over 80F, and will slow or stop producing tubers if the soil gets too hot. If you are in a hot climate, be sure to mulch thickly around the potatoes to keep soil moist and cool.