Answer: There are several things that can cause holes and discoloration on hosta. One is cold damage that occurs when the leaves are just coming up but the damage does not become apparent until the hostas are fully opened and actively growing. Another possibility is hail damage. Yet another common cause is slug damage but since the slugs work at nigt we rarely see them. We do see the tell tale glistening slime trails, though. These can be controlled by hand picking (at night with a flashlight), trapping them with beer-baited traps, or spreading diatomaceous earth around them.
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