I'd probably put cannas there because they can take the heat up against the wall even in the worst summer weather. You can find canna varieties in either standard sizes, that often get 6-8' tall, or in dwarf varieties that stay around 3' tall, depending on the look you're going for. Most have green foliage, but a few have striped foliage in various shades. Often, with a tricky location like that you just have to experiment to see what plants can tolerate the late afternoon or evening sun. Four o'clocks also likely would do well there and are heavily scented, but they drop seeds and every single seed will sprout, so they tend to become invasive. If you decide on four o'clocks, be sure you really, really want them because they form very large tubers that eventually will be the size of your head and they are hard to remove once they are established. Crinum lilies are another old southern garden favorite that could handle this, or any other, location, but their bloom period is shorter than that of cannas. Our crinums have been in the same place for almost 20 years and I've never dug and divided them, and they have survived everything from extreme flooding in a year when their soil never, ever dried out to Exceptional Drought that even killed well-establish oak trees. If I ever work up the courage to try to dig and divide our crinum lilies one of these autumns, we'll probably have to rent a backhoe to do it. By the way all three of the plants I listed for you are on my list of the toughest plants we can grow here in our part of Oklahoma, the list entitled "These Won't Die and You Can't Kill Them". That's why I like all three so much!

Thanks, Dawn! I like cannas, but I assumed they wouldn’t tolerate the shade during the day—though I suppose they come with such interesting foliage they’ll be beautiful even if they don’t flower. A mix of some cannas and crinums could be pretty there, and I love low-maintenance!

You're welcome Marleigh. We have some cannas that only get about 3 hours of morning sun, but they bloom just fine. They do get a little tall and leggy searching for sun the rest of the day, but I don't mind that. Mine are somewhat sheltered beneath the nearby trees, so their legginess isn't a problem because they aren't out in a wide-open area where the wind might break them. I would think yours would do equally well with just some late-day sun. Crinum lilies may not be easy to find, but I bought them as bulbs at either Costco or Sam's Club one spring. If you want to look at some of the kinds of crinums that are available (maybe you have a nearby neighbor who would share some, but none of our neighbors had any), I'll link the crinum page from Plants Delights Nursery, one of my favorite plant purveyors. We have the plain old red and white striped ones but they also come in a few solid colors. I cannot even look at the Plants Delights page without wanting to buy them all. lol. If you buy a crinum, watch for its cold hardiness rating. Some are only cold hardy to zone 7b while others are cold hardy at least as far north as zone 6b.

Crinums at Plants Delights Nursery