To wildscape my backyard this summer I bought a rough-leaf dogwood
because I'd heard that it's fuit is enjoyed by many birds. I guess
it's about 5 years old.

It flowered, but only a very few fruit have developed (maybe one out
of every 30-40 flowers). Is that about par for a young tree? Should I
buy a second tree to cross polinate? Or should there be enough polen
available in the air for that? I live in north central San Antonio on
the edge of the Hill Country.

Thanks,
Bill