California poppy (Eschscholzia californica)
Grow from seeds sown in fall. These plants cannot be dug up and transplanted, so place the seeds where you want poppies to grow. They’ll reseed freely if conditions are right.
Note that the flower centers aren’t the same – the two photos were taken about 350 miles apart, in two different habitats.
These plants can be annual or perennial. If perennial, they die down in summer to reappear after the next season’s rains. If annual, the plants die completely to reseed the next year.