Ask Mr. Smarty Plants

Since you speak about using UC Verde Buffalograss as a permanent lawn, I am assuming that your house must be situated somewhere in the three acres in question.  If that is so, why not plant the area immediately around your house in UC Verde Buffalograss this year.  Do as much as you can afford. It uses little water, is drought tolerant and very low maintenance.  It should continue growing and spreading and you can add more buffalograss next year and continue each year until you have a complete coverage of buffalograss. For the part that you don't plant with buffalograss this year, you could consider planting with native perennials--grasses and groundcovers--instead of the non-native annual winter rye grass.  On bewaterwise.com, the website from the Metropolitan Water District of Southern California and The Family of California Water Agencies, you will fine Leymus triticoides (Creeping or beardless wildrye) listed as a drought resistant native meadow grass.  You can read more about it in the Plant Guide from the NRCS (National Resources Conservation Service) of the USDA.  Recon Native Plants in San Diego has plants of Leymus triticoides and Hedgerow Farms in Winters, CA has seeds for sale.  Larner Seeds in Bolinas, CA has a Golden State Native Grass Erosion Mix with three quick-growing, perennial native bunchgrasses native to Southern California—Hordeum brachyantherum (meadow barley), Bromus carinatus (California brome) and Elymus glaucus (blue wildrye)—that would be another possibility for the area where you don't plant buffalograss.

Check our National Suppliers Directory for nurseries and seed company specializing in native plants.   The San Diego Chapter of the California Native Plant Society also has a list of Sources for Seeds and Bulbs of California Natives as well as other information that you might find useful.

Las Pilitas Nursery in Escondido and Santa Margarita has been specializing in native plants since the 1970s.  Their website has recommendations for lots of different situations.  If you want to intersperse the grasses with perennial groundcovers, they have lists of plants for flat native ground cover and for 1-2 foot ground cover pages.

By the way, the sheep poop should be great fertilizer if it's not full of weed seeds, but I'm afraid I don't know what DG is??