True blue tulips do not exist. Blue tulips are either dyed blue, or are a hybrid of a lilac or blue violet, according to the Online Flowers Guide. The most common colors of tulips are red, orange, red-white and purple.
Blue tulips symbolize tranquility for their resemblance of the sky, and they denote royalty.
Care for blue tulips as you would any other tulip. Plant the bulb root-side down in the ground before the first snow; expect blooming in the spring.
In the mid-17th century in The Netherlands, there was a "tulip mania" where tulips became unreasonably expensive. The eventual crash came when supply outgrew demand, and the government created trading restrictions for the flowers.