With springtime comes anticipation of blooming gardens and leafy green trees. The federal government doesn't have quite the same excitement, we would guess, based on their recent slashing of the U.S. National Arboretum's budget, as the Washington Post reported this weekend. The $2 million eliminated from next year's budget could drastically cut public programming, research on rare and new species of plants, and permanently stall much needed expansion projects. Even worse:Supporters of the arboretum say......