The fastest way would to plant it in wildflowers because the area is so large but it's not evergreen. Junipers would be the ideal but they would cost as much as a wall, but maybe you could find a wholesaler that would sell lining out stock. Whatever you decide there will be no easy solution, because seeds generally need water to germinate so you will have to weigh the alternatives time versus money.

Here is a link that might be useful: Propagating Perennials

Hmmm, interesting dilemma. Sounds like fairly rapid growth, and drought tolerance are key.

A groundcover-type Rosmarianus would fit your needs, but may not be hardy where you live. And I agree the Junipers would be good.

Look these up, and see if they'll fit your needs: Oenothera speciosa, Fragaria chiloensis, Potentilla neumanniana, Phlox subulata, Vinca major, Ceanothus griseus horizontalis and some Cotoneaster.

Good luck.

Thanks so much for your insights. I'm still not sure what I'll do, but the other few homeowners have suggested ivy. What are your thoughts on this? They might be inclined to help with the cost, but I'm afraid that it will creep onto the road below. I'm still researching all of your suggestions. Thanks again.
Kim

Ivy is good but it is very invasive although a cheap alternative until it becomes a nuisance then you might wish for other options. I know HD carries Blue Pacific in one gallons so you might check Wally World. FYI, Blue Rug is a very slow grower.

Ground cover Comfrey, Symphytum ibericum, is very tough, will overcome weeds, and blooms in the spring with blue tubular flowers that turn pink then white. It is evergreen and spreads well.

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