 "Calendula officinalis" is widely cultivated and can be grown easily in sunny locations in most kinds of soils.Although perennial, it is commonly treated as an annual, particularly in colder regions where its winter survival is poor, and in hot summer locations where it also does not survive.Calendulas are considered by many gardening experts as among the easiest and most versatile flowers to grow in a garden, especially because they tolerate most soils.