Well everything grows fabulously well in Oregon. Whatever makes your son and his bride happy is good. Maybe go with her color scheme? Brides pick color schemes these days I understand. Maybe chase off the chickens for the wedding. Or cook 'em? (j/k)

Be very careful with knockout roses. They are NOT low maintenance. They are the #1 shrub we remove for home owners. They will get up to 6' tall and once they are overgrown the bottom roots will look bare. Your best bet it to find an evergreen shrub you like and use it as the foundation plant that will grow to a height you are happy with. If you want roses then consider the Oso easy (3'x3' max height), Drift roses (2'x2' max height) or the home run roses (3'x3'). Can you show us a photo of the area you are wanted to landscape? Also do you know what zone you are in (what state do you live in)? What kind of sun does the area get morning/afternoon, full sun/part/shade?

Have you thought about a pittosporum? There are many different types, and they do well in SoCal, and do well as a green privacy screen. I am a little confused about where your property line is, and the hardscape on your property and what you want to keep. Maybe take your photos and thoughts to your local reputable garden center (where you get real live gardening advice) and ask if pittosporum would achieve your purposes, and if so which one(s.) I do love those dwarf pomegranates, too bad you can't eat them. Speaking of trees, why not plant something you can use. Like a lemon tree. Or two or three. Even their blossoms smell divine. How many figs can one person eat? Now, lemons, that is another matter. I don't know how old you are, but if that was my house, besides the lemon trees, I would build some raised beds. That would make it much easier for you to amend the soil and fertilize and plant and water and maintain in shorter amounts of time and energy, all without overly stressing your back and knees. You can even garden in a raised bed from a wheel chair if the width isn't too wide. Another advantage of raised beds is that the dogs won't get to them, nor can rabbits or most other varmints. Deer can, of course. I would have flowers, because one cannot live by bread (or fruit and vegetables) alone, and once you have grown your own fragrant roses, you'll never go back to store-bought again. Besides, a salad looks so much prettier with violas or pansies sprinkled on it. And for sure, grow things that attract hummingbirds and butterflies. Maybe make your life easy and buy a wild flower mix and just sprinkle and water and be wonderfully surprised. Or get a cosmos mix and sow in un-fancy unfertilized soil and have great flowers forever. Buy a passel of Command hooks and affix to that wall with a string netting and sow sweet peas along the base, especially the fragrant ones, are they ever great in a simple slim vase. Or a mason jar. Put up a very simple water bath for the butterflies and hummingbirds, but get one with a simple bubbler, so you don't have stagnant water, you don't need to invite mosquitos and West Nile Virus. I would grow herbs, and which ones depend on what you need for your cooking. be careful though, mint will overtake the whole garden, so confine that to a pot, and many herbs will not do well with fertilizer, so please read up. In SoCal, tomatoes for sure. And pick ones that mature at different times so you always have a steady crop during harvesting season. Zucchini, peppers, eggplant, oh my. Ratatouille isn't just a movie. But try growing the mini varieties, you don't have that much space, and they are adorable! Also those micro-greens that cost a blooming fortune at the market. Too bad the stone wall isn't a bit higher, you could get some clever person to hook up a twee recirculating waterfall along some part of it with a tiny little bubbling pond with stacked rocks and moss, the motor hidden by the rocks. If you have children, for their benefit, tuck in a little tiny fairy or gnome. There are a myriad of references on the internet for raised gardening beds you can check out, including the best way to water them. Look at what I just found on the internet for outdoor water features or mini water gardens. https://www.diyncrafts.com/26347/home/gardening/20-charming-cheap-mini-water-garden-ideas-home-garden https://www.finegardening.com/article/make-a-big-splash-with-a-tiny-water-garden

How much of the other side of the driveway does your property extend? In my first house I had a similar driveway/walkway. I had the bed go all the way to the driveway and across to the other side. An imaginary line across the driveway is my best description. I always wanted more beds and loved that zone on the garage side that most people seem to forget and not utilize. This also made it easier for me to landscape over time. I cleared the grass out of the new beds and covered in mulch. Then I could choose small sections to fill in over time, not all in one season. The plain mulched areas still looked nice and I would put potted plants in to get an idea of what would work where.