Answer: Apparently, you have a grafted plant. Since grafting is fairly difficult to learn, your best bet is to propagate your shrub by taking cuttings and rooting them. Viburnums are usually rooted from cuttings taken in June or July rather than in the spring, so timing is important.
You could try the seeds, but they are a bit tricky. In general, viburnums go through a double dormancy and need three to five months of warm followed by three months of cold. To try it again, you should use cleaned seed, watch them for radicle (primary root) emergence during the warm stratification, and then move them to the cold. Good luck with your cuttings this summer!
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