They grow above ground. It is a stem plant.
Above the ground
A Swede grows below ground.
Below ground, just like a carrot.
Above ground. It is a flower.
Cabbage grows above ground.
a fruit, cuz fruits have seeds and they grow above the ground
Both
Below ground.
Above ground as the oat plant is like wheat.
No corn grows on a corn stalk above ground.
Tomatoes are fruit which develop at the base of flowers on tomato plants, this occurs above ground level.