Those blooms are beautiful. Do you ever see bats or moths pollinating your dragon fruit?
Yes. I don't do a ton of measuring either, when making tinctures. Some overcomplicate it, imo. I always use 100 proof alcohol. With it being 50% water, that takes care of any properties that need to be extracted with water. It doesn't need to be top shelf vodka either. I fill my jar ¾ of the way full with plant material (I typically use dried material, except with mimosa, mullein, or fungi). With the mimosa, I've used flower only and with stem bark. I prefer the tincture with stem bark (bark is where the pain relief is, flower is the anti anxiety). Try flower only first, if you prefer, to see which will help you best. If you use stem bark too, put in jar last, on top of flowers, to weigh them down. I fill all the way to the top of the jar rim to avoid oxidation.
Be mindful of any pharmaceuticals you may take for anti anxiety or pain. This could interact, but I've never heard or read of there being any issues other than for pregnant or nursing women. In general, be mindful for how it makes you feel.
This is native to Iran as well. They use the root for insomnia.
Enjoy.