Who owns plants propagated by gardener using your plants

in Plants
I believe that a gardener that has been working for us for nearly 2 years has been taking cuttings home without asking and propagating plants by layering then taking the new plants home. Am I right to think that this is not acceptable?
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You must think he's a good gardener if you've had him for 2 years?
As @JennyJ says, it won't be harming your plants as pruning and division increase vigour and it would be daft to risk losing a good gardener.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
Would he be be happy if a helper sold some of his budgies for private gain, without him knowing?