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The problem was lack of diversity of potato varieties, not the lack of other crops. There were loads of other crops grown, but all exported to England, because the Irish were essentially agricultural slaves of British land owners until 10 years prior to the famine.

For contrast, in Peru there are around 4,000 different varieties of potato adapted to a diversity of growing conditions, and an entire system of mythology and folk rituals designed to teach the proper manner of cultivation and maintenance of their distinct genetics from generation to generation.

https://www.irishcentral.com/roots/history/facts-great-hunger-irish-famine-food-ireland-dates