I have noticed 3 plants in my garden that seem to handle the heat so far (other than the Texas "toughs"), they are Society Garlic, Jewels of Opar and my Kimberly Queen ferns, they are just as fresh and green as can be.

What are your best plants in the heat?

Here's my list of bulletproofs:

Crinums: the queens of my summer borders
Salvias: Guaranitica Black and Blue, Mystic Spires, Farinacea Rhea, and purple Salvia lyrata (seeds all over the place, but the leaves are a luscious black purple in full sun)
Heliotrope, Azure Skies: this is a new one and it is a real winner. It's only been in the ground about six weeks and it's blooming like it's springtime. It's perennial too!
Duranta, Gold Edge: gorgeous blue green and chartreuse foliage
Cannas: I grow a purple leaved one, Phaison, and Tropicana. I love them and I hate them, but this time of year, I love them more.
Profusion Zinnias
Rozanne Geranium: I've had it about five years. Nothing stops it.
Tibouchinas
Kalimeris incisa "Blue Star" (only a milky blue but a winner)
Kalimeris pinnatifida is equally good.
Tanacetum, Isla Gold: beautiful feathery chartreuse foliage
Balloon flowers
Zephyranthes Rain Lilies: although I have and like several, to me, the common white candidas are the best of the bunch.
Peachie's Pick Stokesia
Carefree Sunshine Rose: my bushes look fabulous and have not been out of bloom since April.
Double Knockout Rose: ditto
Cupheas

I had been searching for it for two years, when someone here on the forums told me where to get it on line. I include the link below. I got three plants and they are all just beautiful, even though they were planted out late and we've had this awful, early, dry, heat.

I got my original Rozanne geranium online too, but I have since seen it at Lowe's, where I got some more of it. It's the only cranesbill I have grown here that really does well. It is a beautiful violet blue in the spring, but the heat makes it wash to pink. Other than that, it seems to be impervious to our heat as long as it gets water. It's fairly easy to find online.

I got my first crinums as a pass along about 3 or 4 years ago. They are the old Milk and Wine lilies. I traded some rooted rose cuttings for them. I have since been adding to my collection because there is no other plant as showy as these that will go through our mid and late summer season.
I just ordered several new ones from bulbsnmore on Ebay. He is a registered nursery in Florida, his service was top notch and the bulbs look great. He grows 375 varieties, so has about anything you could ever want. I referred to 'Garden Bulbs for the South' by Scott Ogden to help me with my selections. His prices were very reasonable, I thought. Crinums are slow to offset, many don't make seed, and when they do, seed to bloom takes about 5 years. Plant Delights has figured out how to propagate by tissue culture, but that's not fast either. In a word, crinum bulbs are expensive. But they are also permanent.

I hope all this helps you!

Not much else looks good. Even my cannas are ragged. :( The rain that came through yesterday skipped my place. We call it "Moses hill" because the rain always seems to part and go around us. lol