Do you have an iris group near you? They, like our club, aften have plant sales in the summer & those plants are adjusted to your climate. go to www.irises.org to find AIS. Then find your region & you will find the local clubs there. TX is region 17.

Monarda blooms long. Attracts hummingbirds, too
Asters start late but go long. Attract butterflies, too.

That's all my memory will cough up at the moment...

For those interested in SDB 'Black Lightning'. I see that it is in the Aitkin's catalog for $8.