The Texas bluebonnet (Lupinus texensis) is one of five Lupinus varieties standing as the state flower of Texas since 1901. This cold-hardy annual grows wild along roadsides and covers prairies with a striking carpet of bright blue each spring throughout Texas. Growing 8 to 24 inches tall, Texas bluebonnets blooms from March through May, providing densely packed, stunning blue blooms that end in a white terminal bud at the tip. Texas bluebonnets are excellent for mass plantings, borders and raised beds.
Choose a planting location that provides full sunlight (eight to 10 hours per day) and well-draining soil.
Test soil at the chosen planting location to determine pH levels. Texas bluebonnets require a pH of at least 7.5 or higher.
Amend soil with agricultural lime, per manufacturer's directions, if the pH level falls below 7.5. Along with the lime, work in a layer of organic compost and sand to improve drainage and raise the nutrient levels of the site.
Plant seeds in the fall (September through October) for spring blooms. Texas bluebonnets need the cold months of winter to develop their intense root system and drought tolerance.
Sow seeds at a depth of 1/8 inch. For mass plantings, scatter seeds evenly over the bed surface. For individual or border plantings, sow eight to 10 seeds per square foot.
Lightly rake the planting area to incorporate seeds into the soil. For smaller distributions, seeds can be pressed into the soil with hands or by walking over the area gently.
Water the planting site gently to set seeds for germination. Germination occurs between seven and 30 days, at temperatures of 55 to 70 degrees Fahrenheit. Keep the soil moist throughout the germination period but do not saturate it.