The State Flower of Texas is the Bluebonnet, written as one word. Lupinus texensis is the species most often listed, but all bluebonnet species are considered the Texas State Flower.
The Texas Bluebonnet is endemic (native) mostly in the state of Texas. It grows in full sunlight, and grows in uncultivated areas.
There are also white and pink bluebonnets that grow in nature. White bluebonnets are rare, and pinks ones are even rarer. Now there are maroon bluebonnets, although they were developed by two horticulturists, Greg Grant and Dr. Jerry Parsons.
If you want to buy seeds or plants of the white, pink or maroon bluebonnets, be careful where you plant them. If you plant them close to blue bluebonnets, they might naturally revert to their blue color, or the colors might mix because cross-pollination.
Plant Bluebonnets in the Fall, not Spring
Bluebonnets should be planted from early September to mid-November, although a little later will probably be alright.
Bluebonnet seeds need time to germinate and grow during the winter months before blooming in the spring. Bluebonnets need full sun, and well drained and alkaline soil.
Bluebonnet seeds can't just be tossed out onto the ground. The seeds are large with a hard coating which has be be worn down by rain, decay, and abrasion before they can begin to sprout.