I'm back to looking for this again. It's sometimes listed as Berberis fremontii, too. The Arboretum Plant Sale didn't have any: seeds didn't germinate (The person growing the really interesting dryland plants apparently doesn't realize that some things need cold stratification, scarification, giberellic acid treatment and/or a couple years outside to germinate).

I don,t think we live close,otherwise you could have many suckers from me. I find in general everything in the plant world has gone up. ladybug6a

While this seems shady, how much sun does it get? Even 6 hours of morning, early afternoon sun will allow you to plant some more sun loving plants than you might think. It is worth watching the area over the course of a day to calculate the # hours of sun. Mahonias seed around a bit too much and pop up in unwanted places, I would not recommend them. However, birds do love sources of cover, so medium sized junipers would be nice (and they eat the berries). Hollies are another source of cover and berries. Depending on whether your neighbors have hollies (or you have others), you may need more than one as they are male and female plants. Another favorite shrub for birds is Spicebush (lindera benzoin), but you need male and female plants of those too. If you expand the area beyond the dogwood, planting a serviceberry (amelanchier species) would be very popular. The birds love those berries. It is a small tree. Until the plants get a little more mature, you may need to be content with providing cover and water and a supplemental source of food (a bird feeder).

DG plant files has M triloliolata hardy to 0 degrees. The distribution maps do not have it growing north of the Guadalupe mountains in New Mexico. What Zone are you in? Mahonia haematocarpa or red berry Mahonia might be a better match and it is a striking blue also. It is hardy to z5 and distribution maps have it growing into southern Colorado and Nevada. and available at High Country Gardens. Here is a link that might be useful: Mahonia haematocarpa