A squirrel buried a walnut right under my Lavender, Again, so I carefully tried to remove it. Could not pull it out of there, as the top of the soil may have gotten rained on for 10 minutes, but deeper down that soil was solid & dry as it's been like a desert here the past month. We've really had no decent rain here since May...I think May, maybe April. Anyhow, I used the hose shooting water & my hand to untangle the roots, creating a deep mudhole. It took several minutes separating roots with my fingers, bent down, with my arm & end of hose shooting water, in the ground. I probably looked like a real sight lol. The top of the sapling was only maybe 6 inches tall but the roots reached down about a foot, intertwined with the Lavender roots. Well, when I finally got the dang thing out, I moved the muddy mess of soil back into place. I hope the Lavender does Ok, it's really a lovely shrub size & I'd hate to lose it. I don't know why that ornery squirrel Always picks this spot. There are literally acres to choose from dude! Leave the Lavender alone please!
you should prune lavender if it is big and you disturbed roots. it will come back fast. just water it regularly until it does.