|Bed of penstemon and flax|
Various plants, even succulents, have failed on that site. Two survive, however.
One is a purplish-blue penstemon, I forget which variety, which has established itself and even survived last summer's drought, although it was happier this spring.
Gardening sites talk about stratifying the seeds, but I just let it seed itself in the fall, which seems to work best for wildflowers.
The other is a blue flax, and I forget where I got it. Plants of the Southwest?
Here is how it looks on a grand scale. We've encouraged it to spread by tossing seed around.
Yes, they still need watering, but their ability to take the heat, wind, and dryness is impressive.
If I had room for a big flower bed, I would just grow every variety of penstemon that I could lay my hands on.