Answer: Sometimes with an area like this it is helpful to think about other ways to deal with it rather than plants, especially since you have already tried so many different plants there. Maybe you could put a bit of patio and a pretty bench there, or cobblestones with a small water feature, or a birdhouse on a post surrounded by large rocks. Or, you might be able to plant a large shrub or tree nearby or build a pergola or overhead lattice that would add to the shade so the area becomes fully shaded all day rather than being hit by that hot late afternoon sun. I hope this gives you some ideas.
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