As with most species of wildflowers found in U.S. state or national parks, it is unlawful to pick or dig up Texas bluebonnets. Indeed, Texans are entitled to be very proud of their official state flowers. Since legumes have a nodulated root system, they have the ability to provide vital sources of nitrogen to soils lacking sufficient nitrogen for healthy plant growth. Of the five official state flowers of Texas, the Lupinus texensis is said to be the easiest for gardeners to grow. It is recommended that gardeners use transplants rather than seeds for growing bluebonnets and other species of hybrid lupines in their gardens.
Transplants are much easier to establish than plants grown from seeds.
When transplanting, be certain not to cover the crown of your plants as this will cause them to rot and die. Since bluebonnets require a minimum of 8-10 hours of direct sunlight for optimum growth, planting them in a sunny location is of utmost importance. They are quite drought tolerant and should be planted in well drained soil. Overwatering should definitely be avoided once the plants are established. A good rule of thumb to use is to wait until the top inch of the soil around your plants is dry.