If you leave the straw outside in the elements to "season" it will kill all of the seeds, then you can use it in your garden without any problems! The straw keeps moisture in the dirt but you need good dirt or else you'll end up with clay soup underneath. Straw can attract mice, pill bugs and slugs so heads up. In the end, it works great and there is nothing better for your garden. Bury your soaker hoses under it and you're all set. Grass clippings cook the dirt and add a nitrogen blast and leaves break down and mess with the PH as well.
If you leave the straw outside in the elements to "season" it will kill all of the seeds, then you can use it in your garden without any problems! The straw keeps moisture in the dirt but you need good dirt or else you'll end up with clay soup underneath. Straw can attract mice, pill bugs and slugs so heads up. In the end, it works great and there is nothing better for your garden. Bury your soaker hoses under it and you're all set. Grass clippings cook the dirt and add a nitrogen blast and leaves break down and mess with the PH as well.