Assuming the willow hasn't been sprayed with herbicide or pesticide, it should be safe. Unless it is particularly muddy, I wouldn't bother washing it - just cut to suitable lengths to fit in eg a large jiffy bag or box (eg cereal or xmas chocolate boxes) if you are posting it out. It will be OK 'fresh' if it is stored properly, and will naturally dry out. Some people may like longer, thinner bendy pieces to make eg willow balls. Work out how much you can send by the most affordable route eg Royal Mail website gives package size and weight. Letters shapes are cheaper than boxes.
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