I forwarded your question to a hosta listserve.
Hopefully someone will have an answer for you.
To subscribe to hosta-open send a message
in the text part of the message put
----- Original Message -----
Sent: Thursday, February 07, 2002 11:51 AM
Subject: Flowering in Hostas
Dear Sir or Mam,
Where can I find information on how
to induce flowering in Hostas?
Paul D. Pruitt
107 Bloomingdale Ave.
Wayne, PA 19087