I just purchased 'Siloam Double Classic' last summer (July 2014) and love the double bloom! The few DL's I have are in containers and 'Siloam Double Classic' did not bloom this year, either due to the weather; Hot and dry, Hot and wet, Hot and dry or lack of proper care on my part.
. These photos are from last summer:
Sun - August 1, 2014 ........................... Overcast shade - August 12, 2014