SpeedTree is the tree/bush creator that comes with the UDK. Like I answered in a post recently for another member, you can find SpeedTree by going to "Start Menu" -> "Programs" -> "Unreal Development Kit" and then under your UDK folder, you need to go too the "Tools" sub-folder. There you will find the SpeedTree modeler and compiler. The modeler program is what you want at first to start making your own trees.
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