Those wildly sown? (4)
I believe the answer is:
oats
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for oats that I've seen before include "Seed grasses" , "Grains used as food and fodder" , "Cereal grass and seeds" , "Edible grass seeds" , "Cereal plants" .)