How long has the one you already have been there? I always get volunteers seedlings around mine, I just thinned out a couple dozen in fact and potted 3 up for a friend. The best way would be seeds from the one you have, I think they need cold stratification so maybe your winter is not cold enough? If thats the case try the refrigerator.

I have had it for at least 3 years. But I've never had a single volunteer! Now it's possible that I have the wrong plant. There are quite a few of this type that I see on the internet, but this one fit the description of mine the best, so I'm pretty sure that's it. Could definitely be the lack of cold. We don't go below low 40s. I will try the seed in the fridge idea. Thank you.

I bet thats the problem not cold enough or long enough, its a subshrub in the evening primrose family. I've got two other types of evening primrose and they all need cold or so I read. Mine all self sow. The seeds are in a easy to overlook, hard tube thing that looks like a stumpy stem on the calylophus, its sort of difficult to break apart but there are tiny seeds inside. They germinate easily. The other primrose have fluttermills, you can't miss those.

San Marcos Growers might have it.

http://www.smgrowers.com/products/plants/plantdisplay.asp?plant_id=3794

http://www.wildflower.org/plants/result.php?id_plant=CABE6

Propagation Material: Seeds
Description:
Propagation by seed is most successful if sown in fall. Take
cuttings on new growth in early spring, sometimes in January.

Commercially Avail: yes

Thank you, I tried them both but no luck!

Try burying a a section close to the top of a couple stems, use a rock or something to keep the mid part of the stem underground. I have a lot of success on many plants doing that, its less trouble than trying to root cuttings. If it will root by cuttings the buried portions should root in a month or so. Also you might inspect the base and see if you can try separating and digging up a rooted section to start a new one if its a large established plant.

Excellent suggestions and ones that I was considering myself yesterday as I was out in the garden. It is a large, well established and healthy plant (and it might be the last one on the planet!) so I will try both of the methods you suggest. Thank you again for taking the time to respond

Thank you for the thought nevertheless! I am going to try to propagate more myself. I really do love this plant!

WE had barely cold this winter and they still sprouted. just a couple of freezes really, but there was a period of cool nights. Usually this plant is TOO friendly about its sprouting habits. It also loves the alkalinity. And I bet it would like your decomposed granite.

If your not picky on the species, High Country Gardens sells Calylophus hartwegii and C. serrulatus which are similar to your C. berlandieri. Though, you may have to wait until next year to order them.

Living Tree Nursery in San Juan Capistrano sells them