Bluebonnets grow primarily in the state of Texas, but they grow in other parts of the United States under the right conditions. They are most likely to thrive in U.S. Department of Agriculture hardiness zones four through eight.
Bluebonnets are cold-hardy annuals that are native to the open prairies of Texas. They need full sun to be at their best, but they can tolerate very light shade. They aren't fussy about soils and can withstand periods of drought.
Bluebonnets feature fragrant, vibrant blossoms that are at their peak during the month of April. As members of the legume family, bluebonnets strongly resemble lupines in growth pattern and floral structure. They carpet entire meadows with their blue blooms, and visitors come from all over the world to see them. Bluebonnets have come to symbolize Texas prairies during springtime in the same way that colorful leaves bring to mind New England autumns.
Those who want to plant bluebonnets in their home gardens should sow the seeds during the months of September or October. The plants germinate in the fall, and over the course of the winter, their roots develop. Finally, they bloom in April. However, seeds in the lupine family are notoriously difficult to grow, so home gardeners can maximize their chances for success by purchasing chemically scarified seeds from a reputable seed company. Another alternative is to purchase the plants from a nursery and transplant them into the desired area.