Depending on what kind of worms you face, curcurbit has natural kinds of anti round worm properties. On our place, I grow truck loads of curcurbits, ie, cucumbers, squash, pumpkins, watermellon, etc, so I have access to the "guts" of these vegetables. I scoop out a few squash, run it through a blender, and mix it, raw, with a scoop of their layer mash. They eat the mix readily. I repeat in two weeks, and then maintain with a monthly feeding of this compound.
You might also investigate the homeopathic use of black walnut tea. This is an age old remedy. I don't propose to be all knowing about this remedy, but the black walnut has been used for a very long time as a wormer.
You might also investigate the homeopathic use of black walnut tea. This is an age old remedy. I don't propose to be all knowing about this remedy, but the black walnut has been used for a very long time as a wormer.