no but roots can be damageable to them but they do not kill earthworms
Potting mix does not kill earthworms.
Earthworms enrich the soil with their feces and allow air to get to the roots of plants.
The waste matter from earthworms are nutritious for plants. Earthworms also keep soil loose when they dig and move around the soil. This helps roots and water penetrate through the soil easily. Earthworms are widely encouraged in organic vegetable gardening and are categorized as beneficial animals. It is also claimed that chemical fertilizers and pesticides kill off earthworms thus gardens loose the benefits that these worms bring.
Yes, diatomaceous earth can harm earthworms if they come into contact with it.
Yes, because earthworms need wet soil to live. Also, the rocks will cut them.
Yes. Crossbow weed kill goes to the roots and kill.
No, they don't. They don't kill any type of creature.
They will disturb the roots by their movement and so will restrict the growth.
Iodized salt.
Yes, chlorinated water kills earthworms. The worms in question must breathe through their outer layers. The "skin" needs to be kept moist, but waterlogged, with the consequence that too much of any water -- not just chlorinated -- will kill earthworms.
Yes, vinegar can effectively kill grass roots due to its high acidity, which can damage and eventually kill the roots of the grass.
Yes, based on my own experience, seven dust kills earthworms.2nd Answerer says: I concur.