The short answer
When done properly, this will not kill the plants. If it isn't done properly, it most certainly can.
That's why we take all of the correct steps to make sure your plants stay healthy.
What proper prep looks like
Beds and shrubs get wet down before anything runs, covered where they need it, and rinsed again afterward.
Damage happens when a crew sprays and walks away. That doesn't happen on our jobs.
Bottom line
Ask any company what they do with your plants before you hire them. The prep work is what protects your landscaping.