Being sown, they're somewhat astonishingly scattered! (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 "Young folk might sow wild ones" , "Wild ones are sown in youthful excess" , "Grains used as food and fodder" , "A cereal crop" , "Cereal food for horses" .)