My Mandarins are both standard but split to white, so there is a chance of white offspring.
My wood ducks are also the standard color.
Here are a few pics of them
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I'm not in Maryland, I'm in South Dakota. I can ship juveniles though.
Mandarin females do fine if they have a ramp going up to the nest box, and the nest box only needs to be a few feet up. They're not too finicky.
Depending on weather, yes. Probably September.