Plant in full sun or half day sun in a well-drained soils with occasional to infrequent irrigation. This plant is evergreen in frost-free areas but cold hardy with only tip damage in most frosts and returning from its woody base after a hard freeze and root hardy to at least 0°F. Prune plants back to near their base in early spring and tip back after flowering to regenerate growth and flowers - flowering also corresponds with rain or irrigation so plants can rebloom later with some irrigation. A great plant for containers and dry gardens, particularly hot spots in the garden and on slopes. It will drape over and cascade down a couple feet from a container lip or wall.

Calylophus berlandieri is a North American native that comes from the grasslands of New Mexico, Oklahoma, Texas and south into Mexico. The genus name was given to this group of plants in 1835 by French botanist Édouard Spach (1801- 1879) to distinguish them from the closely related genus Oenothera, the Evening Primroses. The name is from the Greek words 'caly' for "calyx" and 'lophos' meaning the "the back of the neck", "a crest of a hill" or "helmet" to describe the unique crested lobes on the sepals. Recent treatment of this species has combined it back with Oenothera as Oenothera capillifolia subsp. berlandieri with the specific epithet from the Latin words 'capillus' meaning "hair" or "thread" combined with 'folium' meaning "leaf" in reference to the threadlike foliage and with the subspecies epithet honoring the French naturalist Jean-Louis Berlandier (1801-1851). This plant is also commonly listed as Calylophus drummondianus to honor Thomas Drummond, a British botanist sent by The Royal Botanic Garden at Kew to collect plants in Texas, but this is considered to be a different plant that has since been renamed Oenothera serrulata. The common names Shrubby Primrose and Texas Sundrop are also associated with this plant.

We grew this great ground hugging plant from 2012 until closing our nursery in 2025. Since we long grew it under the name Calylophus berlandieri we have retained this name in this listing but recognize that it is now not its currently correct name. 

Information displayed on this page about Calylophus berlandieri is based on our research conducted about this plant in our nursery library as well as from information provided by reliable online resources. We also include our own observations made about it as it has grown in the nursery gardens and other gardens visited, as well how the crops of this plant performed in the containers in our nursery field. We will also include comments received from others and welcome hearing from anyone who has information about this plant, particularly if it includes cultural information aiding others to better grow it.