What did Europeans discover would happen if they planted potatoes instead of grain?

When Europeans began planting potatoes instead of grain, they discovered that potatoes were more resilient and could thrive in poor soil conditions. This led to higher yields and greater food security, as potatoes provided a nutritious and calorie-dense food source. The cultivation of potatoes also supported population growth, particularly in countries like Ireland and Germany, and transformed agricultural practices across Europe. Ultimately, potatoes became a staple crop, significantly influencing diets and economies.