Also I find that the correct light intensity can promote short bushy plants.

Just look in my signature at my second grow log. The plants were extremely short and bushy, 12+ nodes at only 1 foot high.

To get bushy plants you need to keep the node length at 1 inch. A good way to get this is to have the correct light intensity and distance, this stops stretching.

Cannabis-Seeds is very right about strains too, Indica are genetically shorter and bushier than Sativas.

Hope we have helped you out...

Take Care

S.L.