We're doing something like this, and it's driving me crazy, but anecdotally the soil beneath our biggest Canadian thistle infestation appears to be the softest,

We're doing something like this, and it's driving me crazy, but anecdotally the soil beneath our biggest Canadian thistle infestation appears to be the softest, most active soil in our otherwise clay yard. It appears as if other stuff might be starting to impinge on the thistle too. It's been more than two years but amazing stuff is coming up.