One drake should be fine if you really want him. If you are thinking of breeding the WH, you will end up with more drakes to either cull/rehome so ask yourself if you can do that. If you aren't thinking of breeding the WH, then just ask yourself why you really want him. If you have a good solid reason, then one drake should be fine. If not, zero is even better.
Thanks for the help!
I guess I mostly just want him because I think the WH are gorgeous and also because I thought males were quieter and wanted one quiet duck? But that doesn't really make sense because with all girls, one male wouldn't really make a difference in volume unless I got all males.
So I guess it would be best to not get one?
But I don't have a problem with rehoming although I might get too attached to cull. And they might be hard to find homes for or not really? Might be harder with mix ducks than purebreds?