pardon me for digging up an old thread (was searching for something else)but
WOW, that is SUCH a cool idea! i'm with you Paul,ive worried too about adding cardboard to my yard...funny thing,my step-father just found a new job(yes!)last week,and it is with a cardboard manufacturer!.
would it be possible to incorporate this idea into homemade paper-making ?
the problem i see right away is that making paper requires making wet pulp from other paper etc then drying it on screens or such...so the seed cant be introduced to that mix since it'd germinate then...hmmm.any ideas out there how to do this this?
,how about if the seeds were coated first with something that iswater-soluble or would wear away, beeswax ,or clay,like that kaolin clay people spray on fruits and grapes etc.would that cause germination?never used it.
or perhaps if the paper was coated on 1 side,then seeds applied while that dried,or another coating to seal them on there ...
sure would make for cool wrapping paper, plant-able artworks,or paper-rolls for planting out a garden?could be color-coded,seeds laid out on 1x1' sheets for square-foot gardening,similar to those roll out mats of "instant flower beds".
heck couldnt any paper/cardboard packaging be made this way? milk cartons etc.
............LOL. ok nevermind, here i thought i was being clever. but people've been seeding all that stuff and more for decades haha.oh well! there are actually dozens of how-to's and videos on doing it.

ops:
adding this one to the project list!
i guess its ok for the seeds to be wet so long as the paper is dried right away.interesting.