That's datura! It's an annual, but will readily re seed. Some do consider it a weed, and it is poisonous, so should be removed from fields where cattle graze.
The indigenous peoples have used the plant for its psycho active properties in rituals and shamanism.
The blooms actually open at night, then last through mid morning. It has a sweet scent at night, possibly to attract the chief pollinators of Thai plant, which are the Sphinx moths.
I'm growing almost the exact one myself this year. See pics below.
I was just thinking that yesterday myself
