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Your junipers are losing their grip on the slope, and weeds are moving in. You need a tough, spreading ground cover to lock in soil and block weeds. Creeping phlox is a solid pick—fast-growing, weed-choking, and throws out a killer bloom in spring. Bearberry is a low, evergreen beast that stays put year-round. Sedum ‘Dragon’s Blood’ spreads aggressively and adds some deep red color. Creeping thyme is another winner, smells great, and suffocates weeds. Brass buttons grow like a dense mat and handle slopes like a champ. To stop the washout, mix in some mulch and small rocks to slow water flow while the plants get established.

https://www.gardeningknowhow.com/plant-problems/environmental/plants-for-erosion-control.htm

https://www.gardeningknowhow.com/plant-problems/environmental/erosion-and-native-plants.htm

You are in USDA hardiness zone 8b, which you will find on plant tags.

Broadleaf evergreens that flower in part shade include Camellia, glossy Abelia, Indian Hawthorne, and Japanese Pieris. Sea of Gold needs full sun to thrive and being on the north side in part sun may not be enough. Here are more ideas:

https://aggie-hort.tamu.edu/plantanswers/publications/NORTHCEN.html

https://aggie-hort.tamu.edu/extension/xeriscape/table4.html

https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-8/flowering-shrubs-for-zone-8.htm

https://www.gardeningknowhow.com/special/shade/evergreens-for-shade.htm

https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/shade-hydrangeas.htm

Hello:

Thank you for sending us your gardening question.

Your plant list looks good but I will caution you that periwinkle is considered an invasive vine. The rose needs full sun which is 6 to 8 hours. I will include some ideas for part sun to replace the rose. You should be able to get two camellias in but be sure they don't shade the third shrub unless it prefers shade.

https://www.gardeningknowhow.com/ornamental/shrubs/abelia/planting-abelia-bushes.htm

https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/care-for-oakleaf-hydrangea.htm

https://www.gardeningknowhow.com/ornamental/shrubs/shgen/shade-loving-shrubs.htm

Squirrels sometimes eat flowers for the developing seeds. These articles should help:

https://www.gardeningknowhow.com/ornamental/bulbs/bgen/squirrel-resistant-bulbs.htm

https://www.gardeningknowhow.com/plant-problems/pests/animals/get-rid-squirrels.htm

You may want a broadleaf evergreen that flowers such as Indian hawthorn, glossy abelia, or azalea. If you don't mind a deciduous shrub, you can't beat a hydrangea. There are so many sizes and varieties nowadays that it is easy to find one for your own garden. I would stick with the ones that bloom on new growth, they are the easiest because their buds won't be killed in a late freeze. Those include the panicle hydrangeas and they have lots of small bloomers now like pinky winky, bobo, and little lamb.

Here is more:

https://www.purdue.edu/hla/sites/yardandgarden/hydrangea-popular-but-confusing/

https://www.gardeningknowhow.com/ornamental/shrubs/shgen/flowering-shrubs.htm

https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-8/flowering-shrubs-for-zone-8.htm

https://www.gardeningknowhow.com/ornamental/shrubs/shgen/easy-care-flowering-bushes.htm

https://www.gardeningknowhow.com/ornamental/shrubs/shgen/deer-resistant-flowering-shrubs.htm

8b is correct on the hardiness zone. Calla lilies would be hardy in your zone and have attractive foliage and blooms. Plants with colorful foliage include caladiums, coral bells. Another possibility is hellebore but it might need more shade. These articles should help:

https://www.gardeningknowhow.com/ornamental/bulbs/caladium/caladiums-care.htm

https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/growing-calla-lilies-and-care-of-calla-lilies.htm

https://www.gardeningknowhow.com/ornamental/flowers/hellebore/lenten-rose-flower.htm

https://www.gardeningknowhow.com/ornamental/flowers/coral-bells/coral-bells-plant.htm