Theoretically, a bucket of pond water with some Hyacinths in willoverwinter in
the greenhouse/garage/shed as long as it doesn't gettoo hot/cold. They can
then be returned to the pond after the last
frost of the spring.
Glad to see
you wrote the word theoretically....because in all my ponding years I have
never known anyone in zone 7 or colder to sucessfully winter any over. Even
with grow lights and the whole bit Jerri

http://www.fringeweb.com/Ponds/JerrisPond