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Sophora secundiflora

I too grew up in Texas, in Austin, where Sophora secundiflora is native. 
 However, I have also been growing them out here in the desert of Arizona 
for some years.  They are a fine and valued ornamental here because they 
are tolerant of great heat, alkaline soils, and minimum irrigation.  I 
would suggest a couple of things for your propagation.  
Germinate the plants in the fall, that reduces the stress of summer, the 
need for what can be excessive summer irrigation, and will give you a 
good sized plant in a container for its first (and most difficult 
summer).
These plants are able to grow in very alkaline soils, I would push your 
soil to be a bit more alkaline than you described.
Give it full bright sunlight from an early age.  
Be sure the drainage in your container is outstanding, these plants are 
very sensitive, particularly when young, to a host of root rots from too 
much moisture in too warm a soil.
Good luck, it is a wonderful plant, and the fragrance in March is just 
heavenly.  Oh, it does not grow quickly, so don't be daunted by its 
deliberate growth rate.
Mary in Scottsdale, at the Desert Botanical Garden.
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