We like to call these our Brug snobs. When I
asked this question most folks will state that
they are Datura due to their upward bud.
This cross was done when I was playing with
both Brugmansia and Datura pollens. I have three
of these plants that was a Brugmansia X Datura
and according to the data can be done either way.
I used Tissue Culture plants at the time so I knew
that they were better quality of plants than the
common plants. When crossing Datura with a
brugmansia it's best to take the Anthers away before
they open. As a datura will self pollenate as the
flower drops. Open gently pollenate the stigma and
close back up. I have also found that the flowers
do not open and bees do not have an interest if the
anthers are removed.
When doing the Brugmansia X Datura cross, I also
remove the Anthers and make sure the pollen doesn't
touch the stigma. Cover the stigma and close up the
Corolla tube.
If you can get a copy of the 1940s crosses made you
will see that the mother of the cross is denominate. So
if you cross a Brugmansia X Datura, your plant will
be more like a Brugmansia not a Datura and vice versa.
You will see signs of the pollen cross.
For those naysayers out there, try the cross before you
judge others.