Question please; Is the status of a plant as an 'annual' or a 'perennial' determined only by whether it survived the winter? In my garden I have had many so-called perennials which did not find my garden a suitable place and did not come back a second year.
According to our ATP database Linanthus grandiflorus is the synonym and Leptosiphon grandiflorus is the accepted botanical name, if this is the correct identification for the plant in question.