Caladiums take quite a bit of heat to come up. The ground must be close to 70° before you will see those up. I usually start them indoors(or in the green house) before planting outside. They like temps between 70° at night and
90° during the day. 50° soil won't cut it and you can actually rot the bulbs before they come up.
My Alocasia Macrorhizas have only just started to show themselves in the past two weeks and most of them aren't even up yet. I am off Sandy Plains Road not too far from you.

Here is a link that might be useful: Planting Caladiums