I grew 3 species Datura, and 'Purple Ballerina' this year. The species one did great and produced LOTS of seeds, but the Purple Ballerina only made tiny pods, which fell off within 3 days of appearing. Any suggestions on how to get seeds next year?
Where did you get the seeds of Purple Ballerina from? If the seeds you purchased were gathered from an open pollinated plant that may be the reason. Daturas do not come true from seeds if you grow more than one cultivar at the same time because Ballerina is a hybrid. I bought my seeds from Parks seed company and no problem setting seeds.
I have not sowed those seeds from the original plant but would not expect to get the same since I grew the white one at the same time. This was years ago before I knew that they cross pollinate.
Bugs would not interfere with seed setting. I think it is in the chromosomes. Spraying won't accomplish anything either. Actually it would dampen the pollen, which may not help.
I grow 3 different cultivars of Datura, but not during the same season when I need seeds. My daughter grows the white Datura inoxia for me since that is her favorite.
Here is a link to carry over Daturas during the winter. It is from my own experience.
Glad you like the photo. So the seeds are open pollinated and most likely won't come true from seeds.
Yes, 16" is large enough for one plant.
As far as the cultivars stratamontiums, my daughter grew them and neither of us were impressed with the flowers. The seeds were open pollinated and I got them on Ebay. Google or search on Ebay and you will find photos of them. Actually, search on the DG Datura forum and you will find a thread that shows many of the Daturas, including stratamontium, and stratamontium var. Tatula. The 2 names I believe are of the same plant.