Bluebonnets are a familiar spring-blooming, annual flower throughout the state of Texas. The most common bluebonnet in Texas is the Lupinus texensis variety. Lupinus texensis is one of the five state flowers of Texas. The fragrant flowers of bluebonnets resemble sweet-peas, and when bluebonnets bloom in late April to May, they form dense mounds of striking blue-purple waves of color. Plant bluebonnet seeds in October through November, and in the spring you'll be rewarded with flowers that attract both bees and butterflies to your garden.
Nick, scratch or file off a section on each of the bluebonnet seeds. You can use a knife, scissors, a nail file or a piece of sand paper to accomplish this. This is a necessary procedure, otherwise germination rates can be quite low. Another way to ensure successful germination is to place the seeds in your freezer overnight. In the morning, pour boiling water over the seeds and soak them at room temperature for several hours.
Prepare the planting area by using a garden hoe to remove all clumps of weeds and their roots. Then use either a shovel or a garden fork to turn over the soil to about 4 to 6 inches deep. If the soil in your planting area is clay based, amend the soil with 3 to 4 inches of old leaves, compost or similar organic matter. By adding a soil amendment, you can help improve the soil so it will be better draining.
Scatter the bluebonnet seeds over the planting area. You can use your hands or a mechanical broadcast seed spreader. (You can purchase a seed spreader at your local plant nursery or garden center). If planting by hand, a good rule of thumb is to plant eight to 10 bluebonnet seeds for each square foot of planting area.
Rake the area gently using a plastic leaf rake or a lawn broom. Try to cover the bluebonnet seeds with no more than 1/8 to 1/4 inch of soil. Then compress the seeds into the soil by either walking across the planted area or using your hands.
Water the planted area thoroughly. Use a gentle spray of water so you do not displace any of the bluebonnet seeds. Germination of bluebonnet seeds can vary from between two weeks to two and a half months. Water the planted area to keep it moist, but since bluebonnets do not like soggy soil, avoid over watering.