The long term effects of drought on Hostas
Josh Spece at In the Country has a great article on this. Here's a bit from it.
"A dry summer and Fall is often the cause of a hosta that shrinks in size from one year to the next. Multiple unusually dry summers in a row can be especially devastating for hostas, as they are unable to replenish their depleted energy reserves."
I read somewhere that the lack of water, particularly in the fall is the most common reason that a Hosta diminishes to the point where it simply does not come back in the Spring. A good reminder that these plants need to remain well watered, unless Mother Nature does it for you, through the Fall up until frost.
Here's the link to the entire article.
In the Country Garden and Gifts