Traditional
dreadlocks styles are now being referred to as Freeform or
organic. The most well known example of freeform dreadlocks
is the Reggae king himself, Bob Marley.
Freeform
dreadlocks are traditionally associated with Rastafarians. This
dreadlocking method tends to produce dreadlocks faster than any other
method and is a "wash and go" style.
Besides shampooing, the hair is not manipulated to a great degree. Over time, your hair will matte and dreadlock.
Some use a "plucking" method to encourage the hairs to separate and form individual dreads.
Another
method for shorter hair is after shampooing, towel dry the hair in a
circular motion to encourage the hair to develop its own clusters.
Overtime the clusters will matte and as they grow will form individual
dreadlocks.
Freeform
dreadlocks are often called "Organic" because they're considered more
holistic and truer representatives of the dreadlock
tradition. These types of dreadlocks tend to get a bad rap in
and outside the dreadlock'd community due to the fact that they
generally lead to uneven or flattened dreads. As a result,
another name for freeform is the "neglect method."
Now don't get me wrong, I've seen organic
dreadlocks that are uniform and even. Although freeforming is
a minimalist method, there are those who do engage in some sort of
twisting either to help encourage a new dread to take place or to
strengthen areas that may have weakened.
Typically
what happens with freeform dreadlocks is crawling. Crawling
is a process by which individual dreadlocks begin sharing a root
bed. Over time, two or more dreadlocks connect at the root
leading to spider dreads/two-headed dragons/treeing/y-locks (different
names for the same thing). Spider dreads are those which if
you follow them down start as one lock but begin to branch off into two
or more individual ones.
Depending
on how they're cared for, the spider dreadlocks can either remain as is
or over time, the tree'd ends may begin to adhere to one another
through natural processes or when the person marries/combines them.
When the spider dreadlocks are combined, a second process of matting begins and one, large dreadlock takes shape. For some people, this phenomenon is encouraged. For others, regular maintenance of your dreadlocks is necessary to prevent this natural combining process.
Finally, the issue of flapping. Flapping is the process by which dreadlocks grow flat rather than cylindrical. Due to decreased styling manipulation, flapping is far more common with organic dreadlocks than any other method.
In the early stages of dreadlocks, there is a tendency for hair to flatten. When your hair begins to aggressively matte, it has far more difficulty maintaining a cylindrical shape or plumping up after it's been compressed. So anytime that you lay on a pillow, wear a hat or engage any other activity that compresses your hair, if you do not take steps to undo the flattening (usually by palm-rolling or finger-twisting the dreadlocks), your dreadlocks will maintain the flattened appearance and once mature, they will continue to grow this way...flat.

Bob Marley's Freeform Dreadlocks