I'm not familiar with that particular mullein, but would say that preventing it from flowering and re-seeding would be a primary concern. Mowing or weed-whacking, or using any means to cut it down before it flowers, and thereafter to keep it flower free would be your first line of defense.

Is it an annual or a perennial weed? If annual, than the afore mentioned should help. If perennial, then using an herbicide like Graz-on may help - I know it's safe to be used in pastures for horses grazing, without removing the horses, but am not sure about sheep. I THINK Round-Up is not safe to keep livestock on the pasture until about 24 hours after using it.

Cutting it off short and keeping it there would help exhaust the roots, and may, if kept up for an extended period, finally kill it, if you don't want to use an herbicide. Full-strength household vinegar (mixed with a little soap to help it stick) can be sprayed/applied to the plants - it's not systemic, so kills only the green leaves, not the roots. It works best applied to young plants. It would probably have to be repeated as the stronger roots resprout, but it is non-toxic to animals.

Hope this helps.

Thanks dibbit. Since I refrain from using herbicides weedwacking is the method. I believe the seeds are spread by quail so cleanup is vital. Perhaps reseeding with pasture blend in the fall will help (if it rains). I guess I was seeking a less labor intensive method ~ not possible in farming. Grow on !