Yes. If the pitchers are open at the top, so that rain would fall in,
then I assume that it what happens naturally. If you put too much 
water in, they will fall over and tip it out again - again I guess 
this is just natural.
 
> 	- Sarracenia psittacina : do I have to leave the plant under water
> 			during all winter ?
> 
> My last question sounds weird, but I read this in a "supposed to be" good
> book, but I am a bit suspicious about this information.
Yes - I've read this too. One of Slack's books? We had some 
discussion on this a while back. I think people said it was OK to do 
this. I haven't done it with mine because I haven't got a container
large enough to take the Sarracenia pot and the water.
My S. psittacina have never grown very quickly. I have four plants,
which grew (with other kinds) from a packet of mixed seed about
5 years ago. The largest 'leucophylla' type from this sowing is now
a huge plant, whereas the psittacina now have a diameter (pitcher tip
to pitcher tip - they grow flat to the ground) of about 5 inches/13cm
and have not yet flowered.
-- Clarke Brunt (clarke@brunt.demon.co.uk)