Answer: Congratulations on your lavender success story!
The seeds you planted were from quality "seed strains" which are seeds from carefully selected parents exhibiting certain characteristics; some seed strains are better than others and therefore are named and the resulting plants should overall exhibit similar characteristics to the parents. However, the literal duplicate of a specific lavender plant would need to be grown from a rooted cutting. To be sure of duplicating a specific lavender plant you like, you would need to take actual cuttings from it. The person you talked to told you the truth.
You now have the opportunity to make your own selections from among the seedlings you started; some individual plants will thrive better than others under your local growing conditions. What fun!
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