
There are actually five other species of Bluebonnet besides Lupinus texensis, which is by far the most common. These include The Annual Lupine (Lupinus concinnus) which is found in the Franklin Mountains near El Paso; the Big Bend, or Chisos Bluebonnet (Lupinus havardii) which is the largest and darkest blue of all the bluebonnet species; the Perennial Bluebonnet, which is found in the Big Thicket area of Texas; the Dune Bluebonnet (Lupinus plattensis) which is very rare and found only in the panhandle of Texas; and the Sandyland Bluebonnet (Lupinus subcarnosus).
All of the variety of bluebonnets are in the Legume or Bean Family (Fabaceae) and they do well in poor soils due to their ability to fix nitrogen from the air to help them grow. They all grow in best well drained areas and prefer full sun. Most of the bluebonnet species are cool season annual plants, which germinate in the fall and grow their roots during the winter, so that as soon as it starts to warm up in the spring they can leaf out quickly and produce their flowers and make seed before they are killed off by the summer heat.
Because bluebonnets are annual plants, it is very important that they are allowed to produce seed each year, so that there will be another crop the following season. If the blooms are mowed down before the seeds are fully developed, the population of bluebonnets in that area will slowly dwindle away until they are all gone.
Here are some tips for growing your own Texas Bluebonnets.
- Plant the seed where there is a little or no competition with exotic grasses, such as St. Augustine or Bermuda. These grasses will choke out the bluebonnet seedlings.
- Plant in a spot that gets at least a half a day of direct sunlight.
- Plant in a well drained area. Texas Bluebonnets are thought to have originated in the Texas Hill Country in the gravely granitic soil around the Enchanted Rock area. So a hillside or rocky area is usually best. If that isn’t possible, spreading a 4 or 5 inch layer of decomposed granite makes a nice well-drained bed for starting bluebonnets.
- Be very generous with the amount of seed that you put out. For a minimum planting rate, use 1 lb of seed for every 2,000 square feet. But to get that picture-perfect display, use up to 10 lbs per 2,000 square feet.
- Be sure and press the seed firmly into the soil, but do not bury the seed more that 1/8 to ¼ inch deep.
- Plant the seed between September 15th and November 15th for the best results the following spring.
- And lastly, be patient. Not all of the seed will germinate the first year and sometimes it takes a couple of years to get that really knock-out display.
Often people call us at Native American Seed and ask about scarifying the seeds by using a blender or some other method. When you do that, you are encouraging all the seeds to germinate more quickly, and more of them to germinate at the same time. But if some unfortunate weather event comes along, more of your seedlings will suffer the same fate all at the same time, too.
Nature gave the bluebonnets those big, hard seeds so that they could germinate over time at their own pace... and so that a larger proportion of them would have a better chance of surviving one or the other extreme Texas weather event. We've generally found that it's best to cooperate with nature and plant the seeds as they are.


