Ben: I'm sure you already know this, but the forestry mulcher only removes the tops of the honeysuckle plants. It does not kill the root system. So, if you didn't apply something to the shattered stems right after they were cut, you'll see substantial multi-stemmed regrowth in the spring. By the end of the season, it can appear like nothing was ever done ... the honeysuckle canopy may even become more dense.

If that happens, you can target the new green growth with glyphosate. Despite all of the misinformation about this herbicide, it's actually the only systemic that will take out the honeysuckle without leaving a residue that suppresses or damages non-targeted plants. For example, it breaks down in the soil without being taken up through the root systems of trees, causing damage to the trees. Roundup is no longer glyphosate.

You'll need to do some shopping around to find products with glyphosate as the active ingredient. Also, you'll most likely need to make multiple applications starting in the spring because it will take time to kill the honeysuckle roots where carbohydrate supporting regrowth is stored.

Finally, there are many options for establishing native plants in a forest, with one being just to let nature take its course. On the other hand, I just did a Google search using "native plant seed for forests" and found many options, including suppliers.

However, I need to stress that nothing will outcompete the honeysuckle until it's totally eradicated. Even then, you'll need to be vigilant because honeysuckle is spread by birds transporting the seed, and no native plants will prevent re-establishment.