The USB port can, but you will most likely need a USB converter:
http://rayshobby.net/cart/accessories/acc-usb/usb-fa-mb
that allows plugging in a USB cable into the USB port.
As an alternative solution, keep in mind that you can also power OpenSprinkler DC using a USB adapter plugged into the USB port (instead of power adapter that came with the controller). This way, you can use one single USB power adapter with two ports: one port powers the WiFi adapter, and the other power ports OpenSprinkler DC. The circuit is designed such that it can drive sprinkler valves using USB power.