Understand that 'tuber' refers to a specific part of some plants, usually underground. Farmers harvest the tubers of potatoes in the autumn.
Pro Tip 2/3
Food Storage
'Tuber' implies the plant part is for storing nutrients, useful during winter or drought. The tuber acts as food storage for the plant through the harsh winter.
Pro Tip 3/3
Not Always Edible
Though many tubers are edible, some may be toxic or inedible; 'tuber' doesn't mean it's food for humans. Be careful not to eat wild tubers as they may not be safe for consumption.