For me, seedballs failed. The few plants that came up looked like they were short on
water.
Then again, I accidently spilled some grain on my
lawn, the grain got rained in, and ithe grain came up looking well and healthy.
I really think that if the rain settles the wheat seeds into the ground that it will work. I would like to try this in a week or so, just before the next significant precipitation.
I live in Kansas, in the breadbasket of the nation. While the soil is rich the climate is rather harsh. Seed balls might work in a more humid climate, but I experienced problems with them.