This product is mainly for use in flowerbeds, where you would use something like peatmoss to retain moisture in the soil.
Good luck with your yard this year! Stick with it it!
We live in AZ, used square foot gardening last year - successfully - and intend to put in six more beds this spring.
A huge ingredient in the soil in the SFG is peat moss. Sounds like I need to try this in some since "retaining moisture" is very desirable here.