Dreadlocks are not dreadful....lets refer to it as Locks...So Lock dat in your Brain

Dreadlocks Many Rastas grow their hair naturally to form dreadlocks, but not all do, nor is it a requirement. Dreads are achieved by allowing your hair to grow without combing, cutting or interfering with its natural course. Dreads were, and continue to be, worn by many cultural and religious groups. They were not originated by or limited to the Rastafari community. Thus, dreadlocks alone do not make you a Rasta. However, for those who choose to dread, it is an expression of loyalty and submission to the religion.
During the movement Rastas wore their hair in dreads to contrast the straight and thin hair of their oppressors. Other than their natural symbolism, dreads were a way of accepting personal beauty and the differences between the Jamaican peasantry and the white class.

For some, dreads represent the Lion of Judah. The hair appears as the mane of a lion, a representation of strength; the strength that the first Rastas and their ancestors exemplified during years of oppression. Others find their dreads to be their crown, symbolizing the crown of their Jah, Selassie.
Many wear dreads in compliance with Biblical references. Some of these references are listed as following:

Numbers 6:5
All the days of the vow of his separation there shall be no razor come upon his head until the days be fulfilled in which he separateth himself unto the lord, he shall be holy and shall the locks of the hair of his head grow.
Numbers 6:7
…the concentration of his God is upon his head. All the days of his separation he is holy unto the lord.
Leviticus 19:27
Ye shall not round the corners of your heads, neither shall thou mar the corners of thy beard.
Ezeikel 8:3
And he put forth the form of the hand and took me by the lock of min head.
Song of Solomon 5:2
My head is filed with dew, and my locks with the drop of the night.
Song of Solomon 5:11
His head is as the most fine gold. His locks are bushy and black as a raven.
While dreading up, patience and personal growth is key. Ultimately, dreading one's hair is more of an educational and spiritual pursuit, in terms of Rastafari, than the fashion trend that has come to be today. Many Rastas, especially women, do not wear their dreads publicly because of the personal meaning and reasonig that backs them. Some Rastas cover their dreads and wear them visibly before family alone.

Colors

Red, Yellow, and green are colors that trigger one's thoughts to Rastafari. These colors are symbolic of the movement, including Garvey's involvement and continue to represent Rastafari today. Red signifies the blood that was shed by the martyrs for the Rastas, yellow signifies the wealth of the Africa, and green signifies the vegetation and resources of Africa. Furthermore, these are the colors of the Ethiopian flag. Black is also used to represent Africa.

Lion

The Lion that is often connected with Rastafarians represents Haile Selassie I. He carried the title of The Conquering Lion of the Tribe of Judah. As dreadlocks do, the lion represents strength and the struggle that the Rastas endured during the Rastafari Movement at the hand of their oppressors. Becuase the lion captures the spirit of Rastas, this symbol can be found on most things affiliated with Rastafari.