Hi Angela, thanks for the question.

There are a few possibilities to why your potato flavor is not good.  Light exposure to the tubers both when growing and in storage can cause bitterness due to the production of solanine when exposed.  These potatoes that appear green should not be eaten. Keep tubers covered with soil and harvested potatoes so they are not exposed to light. Improper watering, soil pH, and environmental issues can also influence flavor. Try to water properly and consistently.  Make sure you have good drainage. Potatoes like a low pH (5.5-6.0) and the proper nutrients.  If you haven't done a soil test (Home | MSU Soil Test) recently, it would be helpful. Potato variety will affect the flavor also. Pick varieties that fit the intended usage and cooking method. Be sure to buy certified seed potatoes Do not use grocery store potatoes. Check out the following links for more details and additional information.

Growing Potatoes (msu.edu)

Growing potatoes in home gardens | UMN Extension

Growing Potatoes in a Home Garden | University of Maryland Extension (umd.edu)

potatoes_handout.indd (ucsc.edu)

I hope this is helpful.