I have 4 fern leaf lavender bushes that have died from the cold. How do I harvest the seeds? I have cut off the flowers but unable to dig out or shake those tiny seeds loose. I really don't see any seeds at all.
Many common lavenders do not make seeds and some that do are sterile seeds. Plus, even if you have non-sterile seeds germinating them requires cold stratification and has a very low success rate. Lavender is best done from cuttings. The link below gives you all the details on the various types of lavender and how to propagate them.
Here is a link that might be useful: Lavender