Bluebonnets are native to Texas and are the state flower. They are a type of lupine, and their scientific name is Lupinus texensis. Bluebonnets typically grow to be between 1 and 2 feet (30-60 cm) tall, with a spread of about 1 foot (30 cm). They have blue-violet flowers that bloom in the spring. Bluebonnets are a popular flower to grow in gardens and are also used in wildflower bouquets.