You might consider some tree aoenium's. They like it dry in the summer. They can look bad in the sun during the summer but can look OK if placed in the shade. If you can not leave them outside in your area bury the pot & bring them in during the winter.

if you send me a sase (with enough postage for 1.5 oz) & i'll send you some beans--willow-leaf limas, mississippi silver cowpeas, rattlesnake beans, and various yardlong beans. all of them grow very well here in fla. all are very productive and disease free or resistant. all of them (even the cowpeas) love trellises. an inexpensive trellis can be made in minutes from three pieces of 10 foot electrical conduit (galvanized--$3 at lowes) and two 90 degree elbows (i use the heavy-duty plastic ones, $1 each). make a ten foot by ten foot u-shaped trellis, drive it into the ground a couple of feet (you can just push it through the sand). run a line of twine along the bottom and then run twine in zigzags from top to bottom. tahdum. the ten-dollar,ten-minute trellis. i have grown countless beans on such trellises. my address: mad 723 n amelia ave deland, 32724

I am also doing a Mesic/Dry prairie garden going on three years at it. You listed E. paradoxa. Do you mean Fallugia paradoxa? I have that one I grew from seed years ago and its one of my favorites. Another favorite shrub is Chamisa. Actually, I took out the entire lawn, front and back, and the whole thing is a dry prairie. I have many varieties of winter hardy cactus, winter hardy agave, SW Natives and grasses, Desert Spoon, Beargrass, and many Desert and arid type perennials. I started adding the grasses last fall. My favorites are Little Bluestem, Blue Gramma and Stipa tennussima. I got 4 of the huge Giant Sacaton grasses from High Country Gardens and they are supposed to be monsters. Two plants that add lots of color that have naturalized and which bloom non stop all spring/summer/fall are Desert Marigold (Baileya multiradiata) and Flame Flower. I absolutely recommend the desert marigold! I put in some varieties of penstemon last year and they bloomed gorgeous this spring. Very impressive was Penstemon palmeri (Pink Wild Snapdragon). I ordered a Prince's Plume (Stanleya pinnata) from Great Basin natives and also a Mormon Tea and both are in their third year going strong. I have many other perennials from when I ordered seed from Plants of the Southwest and I traded a lot with a woman in Texas who sent me Texas natives. I can make list of other suggestions if you are interested. I also ordered some mixed wildflower seed from the Sonoran Desert and got some that way. Its an addictive thing, collecting plants that have a "certain look". It its rangy and odd or rugged, I love it. Its fun to figure out what some unknown something is by searching on line too.

The best edging flower I've used that can take full sun, all the heat of a TX summer, and very limited amounts of water is Blackfoot Daisy which is covered with pretty white petaled flowers. It mounds if put in the ground and trails if in a pot. Not much eats it and I've never had any disease problems with it. A sure way to kill it is to overwater it. It is perennial so cut it back to about 4-6" in early spring and it will take off again. I lost several in the ground this winter with all the moisture we had but the ones I had in pots that drained well are already blooming. You could also consider Dahlberg Daisy, a short growing little yellow daisy that is sometimes called bitter weed because cows that graze on it give milk that has a bad flavor. Dahlberg Daisy has fine fern like leaves. If you bruise the leaves it gives off a scent that some people find offensive. I like it because it tolerates heat and full sun and requires very little water. I've not found anything that eats it, either. It's an annual but it will reseed if the blooms are left on to dry. I've used both Blackfoot and Dahlberg Daisies as the "spillers" in pots and to fill in bare spots in my perennial garden. Good Luck!