why do roots in flowers have to spread out?

Question: why do roots in flowers have to spread out?
- Keywords:
  flower,
  root,
  spread
Asked by Helium2 to Ajay, Kate, Kuntal, Pip, Reka on 16 Nov 2016.
- Kate Elliott answered on 16 Nov 2016:
  
  It gives them more access to water and nutrients and helps make the plant more stable in the wind.

Question: why do roots in flowers have to spread out?