Brooklyn1 wrote:


but horse
manure always contains lots of seeds don't use it unless it's been hot
composted to kill the seeds.

No, you are over generalising. It depends on what the horses have been
eating. There are plenty of situations where horses on either hard feed or
pasture do not eat viable seeds. If you don't know then test some first and
if it sprouts then hot compost it. There are other reasons why you might
want to know the provenance of your manure as well, such as the possibility
of contamination.

David