One of the best ways to ensure success in your garden is to plant according to zones.  The Tulsa area is in zone 6b.  As seen below we have an average minimum temperature of 0 to -5F.  

USDA Hardiness Zone Map.

The American Horticultural Society has also developed a Plant Heat-Zone Map.  This map is very helpful when choosing plants that will survive our hot summers. 

To view this map and read about how it was developed click below.

Plant Heat-Zone Map