Gladiolus "black cherry" is a hybrid variety of Gladiolus, you can find lots of pictures on internet. I didn't find any variety of G. dalenii named 'Black cherry', only 'Boone', 'Bolivian peach' and 'Halloweenie'. You will have to wait until it flower to know if you have "Black cherry", dalenii or something else...
Both are summer growing gladiolus. Dalenii is hardy till zone 7-8, varieties are are usually less hardy.