"Dwight Sipler" wrote in message
...
quest wrote:

The fact that hay has more seeds in it seems to be moot, since heavy
mulch
keeps them from getting enough sun to sprout...



Maybe with some types of hay, but leave an unbroken bale of seedy rye
hay outside next summer and see how it grows.

That works fine to get rid of the weed seeds. Leave the bale out in the
weather for a month or so on a pallet until it begins growing on one side
and then turn it over until it begins growing on the other side. Then put it
some place where it won't be rained on and let it dry. Store the bales and
use them as mulch the following season. Very few weeds seeds survive to
sprout the second year.

John