Hardiness: USDA Zone 8b: to -9.4 °C (15 °F) USDA Zone 9a: to -6.6 °C (20 °F) USDA Zone 9b: to -3.8 °C (25 °F) USDA Zone 10a: to -1.1 °C (30 °F) USDA Zone 10b: to 1.7 °C (35 °F) USDA Zone 11: above 4.5 °C (40 °F)
On Aug 13, 2005, htop from San Antonio, TX (Zone 8b) wrote:
I have not grown this plant but have observed it in its natural habitat. It is native to Arkansas, Louisiana, Oklahoma and Texas. It prefers sandy loam or limestone soils; but, it will grow in clay loam, medium loam and sandy soils. Texas yellow star, is an upright plant that grows to about 20 inched tall. It usually has a single stem with long, bright green leaves crowded along it. The yellow, five-petaled, star-like blooms appear singly or in few-flowered clusters at the tip of the stems. Sometimes Texas yellowstar blooms when it is only 2 inches tall and then continues to bloom while it grows taller. Only the ray flowers produce seeds and the plant has 5 ray flowers; therefore, there is one fruit per ray flower resulting in the five fruits that are in the achene. (See photo I have posted). Texas yellowstar is a winter annual. The fruits will fall to the ground. The mother plants die after the fruits have dried. The seeds will germinate in the fall and a basal rosette of leaves will be formed. Until the weather warms, the basal leaves will grow slowly throughout the winter. In February, the plant will begin growing quickly and produce flowers. Gather the seeds in about May or so. Texas Yellowstar is easily cultivated and does well in garden settings as long as the soil is kept dry. It is a great xeriscape, wildscape or rock garden plant.
Update, I have grown these after rescuing them from a new housing development where they were going to be plowed under. They have performed very well. They seed quickly. Mine have grown to a heihghjt of about 26 nches and are nonstop bloomers.
This plant has been said to grow in the following regions: