Brain Damage

This sort of growth usually occurs when a plant is not getting enough light intensity. They stretch and grow very lanky so as to receive more light. Genetics can play a part, with Sativas being longer and more stretched out than Indicas, which generally stay smaller and more "squat" and with close internodes. Flowers on plants like this one usually stay around the nodes and never form entire branches filled with flowers, however, there are some Sativas that will flower the whole length of the branch with the internode distance that your plant has, however those flowers are usually very light/airy/fluffy and not very dense at all. Apart from increasing the light intensity, there is little you can do to change this plants morphology. Hope this helps,... Organoman.

While genetics plays an important factor, internode spacing can be managed by the temperature differential between your grow environment’s night and day temps. Warmer days and cool nights will cause a plant to stretch. Day and night temps which are similar will minimize stretch. There are many factors but this is what I use to control height.