okay I looked at several different areas, I concluded this,,,
Temperature Too High or Too Low
Lack of Pollination
Nitrogen - Too Much or Too Little
Humidity Too High or Low Humidity.
Lack of water
Stress from insect damage or disease
The most frequent cause of tomato blossom drop is temperature.
High daytime temperatures (above 85 F / 29 C)
High Nighttime Temperatures (Below 70 / 21 C)
Low Nighttime Temperatures (Below 55 / 13 C)
I live in Tx and I have one growing
out of a pot,, I didn't plant it, I guess a bird gifted me with it.
Next year I will go buy one,, but I will Buy a Heat tolerate variety
In the mean time I will baby this one along and see what happens