It could be normal. It depends on what kind of variety you had, for example, English lavender can last over ten to fifteen years and some other kinds only a few years.

Ahaha, did you know that back in the old days that is how they kept the clothes fresh for all the aristocrats and stuff? xD I learned that last year visiting one fancy castle in Northern Ireland, the guide was so enthusiastic.

Yep, lavender is pretty effective for better sleep. I use the oil though.