The family of plants commonly known as the potato family are geophytes, ie they grow in the soil. The actual potato that we eat is a starch storage tuber that grows under ground. The roots of the plant are also found underground with green foliage above ground.
Both
The potato tubers (potatoes) grow below the ground, but most of the potato plant (leaves etc.) grows above ground.
I think its spinach I'm not sure
They grow above ground. It is a stem plant.
Above the ground
above.
A Swede grows below ground.
Below ground, just like a carrot.
Above ground. It is a flower.
Cabbage grows above ground.
Below ground.
Above ground as the oat plant is like wheat.