Our frontage is a slope as well, but ours is pretty much in full sun. The slope was planted when we purchased the property and on it is sage, trailing rosemary, freeway daisies, some ice plant, a couple wild roses, verbena and lantana. It's pretty much a mass of color.

You might check with your local nursery for ground cover options that thrive in shade. Some low growing salvias love shade, and have pretty blooms. Blue Plumbago might be an option, but it can grow pretty large.

Good luck to you! That's a really pretty area where you live!

Edit: How will you water your slope? Ours is watered by tall sprinkler heads that shower down the slope every other morning. The water is only on for about 10-15 minutes, but it seems to work well. Our frontage is about 200 feet as well.

This post was edited by desertdance on Thu, Jul 24, 14 at 13:43

Looks like this area recieves morning sun. What plants have you thought of? Are you a contrast fan, like burgundy, lime green and orange? Or softer combos like purple, lavender, pinks and white? Scary to have so many choices! Choosing a color palette would help narrow the field. At nurseries place plants together to see if the combo pleases you. I have also noticed professional landscapists plant too close together for quick coverage and in 5 years it's a nasty job to thin.

I like the triple layer effect. The existing trees are the tall, next layer is the medium height shrubs, and in the foreground lower growing plants.

This links to a list of drought resistant plants for So. Calif.
http://patwelsh.com/wpmu/blog/california-natives/native-plants-of-southern-californiaâÂÂs-coastal-zones/
Google hellstrips for plant combo ideas.

combo 1
Loropetalum chinensis var. rubrum 'Burgundy' / Golden Diosma (Coleonema pulchrum 'Aurea') / Bottlebrush 'Little John' (Callistemon citrinus - dwarf) / Copper Canyon daisy (Tagetes lemonii) / an agave here and there for punch.

combo 2
Cotinus coggygria (smoketree, slow growing) / sword fern (the narrow, common one that has runners takes my CA afternoon sun and no regular water- sorry don't know botanical name) / Artemesia 'Powis Castle' / pink carpet roses

combo 3
Ceonothus / Russian Sage (Perovskia atriplicifolia) or Mexican sage (Salvia leucantha) / pink carpet roses

combo 4
Pride of Madiera / white Rhaphiolepis / Salvia Indigo Spires / hot pink ivy geranium

combo 5
dwarf citrus trees / Loropetalum / yellow bush daisy (Euryops) / red fountain grass (Pennisetum setaceum âÂÂRubrumâ ) / agave for punch

combo 6
Pyracantha / variegated Pittosporum / white agapanthus / the petite green sedum - grows fast!

lower growing stuff
trailing lavender lantana (Lantana montevidensis) - nice with blue prostrate rosemary
nastursiums (will reseed, grow here on winter rain only - removal of dying plants needed)
gaura (pink or white)
Gold Star Esperanza (Tecoma stans 'Gold Star' - 4ft)
succulents

Here is a link that might be useful: CA coastal drought resistant plant list