I have grass weeds choking my 70' x 70' organic garden. My beds are raised except for the blueberries and fruit trees. I've tried cardboard, newspaper etc. The problem is that each year I have used manure to fertilize and and straw for mulch - there must be a lot grass seed in both and in the end it looks like I've been planting grass.

Some questions:
The horse and sheep manure has been free (compost is not easy with my 8' snowy winters). Anyone else use manure? Do you have grass seed issues with it and what do you do?

I am in the process of putting down weed fabric to cover the whole garden. I am getting a wood chipper (for cedar, hemlock, pine) to mulch everything (berries, trees, raised bed veggies) with chips. I plan at the end of each year to take off the chips and fabric from the veggies and start over. Comments on this idea?

The grass is so intermingled with the roots of the blueberries in particular. To get at the roots, I'd need to tear apart the ground around the very multi-branched stems. I'm concerned it will harm the roots and kill new shoots. Will weed cloth and wood chips take care of this as well?

Thanks for your help.