I would plant rye grass unless you are mulching with something that will add to the health of the soil. You can turn the rye under and it will add nitrogen to your soil in the spring. I assume you are using the soil in your yard to fill these beds? Since you mentioned the PH. Why not mix in some compost, cow manure, etc. and cover it with grass clippings and let it cook?

Well you will not like my answers or comments. It is Rye Grass, very cheap low quality Rye Grass. With that said it does not make one bit of difference what kind of grass it is as the treatment is the exact same for any of them. So what can you do? Not much except learn your lesson. Do not over seed Bermuda in the Fall, and enjoy Fall and Winter without much yard work. For now if the last frost date has passed or in the very near future, scalp the yard as low as your mower will go, and rake up the debris. Once the Bermuda has greened up about 50 to 75%, start your yearly fertilizer applications. As the weather heats up and the Bermuda starts growing will kill off the Rye Grass or whatever grass it is. So no worries, relax, and the problem will take care of itself providing you follow proper maintenance routine.

Thank you Jim. I knew the rye would do well here because we sewed it in our front yard a couple of years when I kept smaller children so they could play outside and it would not be so muddy and nasty after rain in the winter but did not know that winter wheat would grow in this area. I appreciate your responding. Jan

Kurchian, The advice from your local nursery was to plant Annual rye grass with some wildflower seed. The annual rye seed would only grow this year and would not return or re-seed for next year in your zone. This is a quick temporary fix for your bank. To be clear there are different types of rye grass seed, perennial, winter, annual, etc and annual rye grass seed will not return next year or re-seed but will grow quickly with adequate water and sun and could provide a grassy area for this midsummer though fall . I suspect the recommendation for a hydro mat was due to your comment that the area is difficult to water. You might estimate the cost of the mat for your square footage as I suspect it could be pretty costly. What is your long term goal for this area?