how much does the average cannabis plant weigh when dried??? =)

Giving an average seems meaningless, to me at least, because of the many variables that determine size and weight. Indica or Sativa, grown outside or in, potting soil or hydro, type of fertilizer, the list goes on...

What's the most you could get out of one plant ever is the real question.

yields are different between strains. yes its sort of pointless. think of how many cannbis plants grow to be about 1" tall in far away jungles then get stepped on by something and die...that would greatly reduce the average.

How long is a peice of string...

daytripper do you mean how much will smoking material will you yield from a plant you grew?

It all depends on the strain like said before and in some cases it depends on your experience as a grower and your growing methods.

There are a lot of equatorial sativas that average a kilo plus yeild per plant dry. Thats pretty fuckin good. Most indicas yeild around an ounce or two dry weight indoors