1. It was the mubaarak habit and sunnah of Nabi (Sallallahu Alaihi Wasallam) to grow his hair (i.e. not shave off the hair of the head). The Hadith explains that the one who has hair should take care of it.
عن أبي هريرة أن رسول الله صلى الله عليه وسلم قال: من كان له شعر فليكرمه. )أبو داود رقم 4165)
Hazrat Abu Hurayrah (Radhiyallahu Anhu) reports that Rasulullah (Sallallahu Alaihi Wasallam) said: “The one who has hair should take care of it.”