I am no lavender expert but have grown many many plants in my Mandurah
garden over the years. When they become "leggy" I have chopped them right
back to the main trunk and they have regrown wonderfully. Many of my plants
are now around 8 years old! It may be the climate where I live I am not
sure but I know my husband - prior to our marriage - used to "trim" his with
his rotary lawn mower and they always came back. He is definitely not a
gardener!! but I love him all the same.

Sue. Karratha WA.