A common sight in some parts of Texas are the Indian Paintbrushes and Texas Bluebonnets. The Texas Bluebonnet is a biennial plant endemic to Texas and is also the chosen State flower (includes five species of the Lupinus). Only a small portion of Texas has the prime soil and climate for the Bluebonnets so the best place to start would be Ennis, Texas, the official Bluebonnet city of Texas and the best time of year is between Mid-March and Mid-April. Apart from their great looks, the Bluebonnets are natural fertilisers by improving levels of nitrogen in the soil which is needed for most crops and grass for livestock.