Mullein is not invasive in so much as it is opportunistic. It thrives on poor, recently disturbed soils(like a logging operation), and as bueller said, no benefit to deer. Those are 2 year old plants, as the tall stalk only comes on in year 2. In the first year they simply produce the rosette portion of the plant close to the ground. Cut the seed heads off the top and burn them just to keep more seed from entering the seedbank, then take a spade shovel and shove it under the rosette to sever the taproot, you can burn them with the stalks if you like. It is persistent, so you may have to do this again next spring, but try to catch them in the early rosette stage and spade them out of the ground before the send up the stalk. If that is pokeweed, I believe deer will browse it, but I still wouldn't want it to drop a bunch of seed, I would try to eliminate that before the seed hardens and drops. Mowing should work for that.