Ranunculus Flower Annual Or Perennial. Ranunculus are cool season flowers that grow best in spring-like temperatures of about 55F. Persian buttercup is a good candidate to grow an an annual because its flowers are so attractive.
It is easiest to grow the bulbs in pots overwintering them in a greenhouse or cold frame and bringing them out in spring. Persian buttercup is a good candidate to grow an an annual because its flowers are so attractive. Annual and biennial plants have to be replanted often because they do not last long.
The answer to that question depends entirely upon where you live.
The leaves are usually alternate and palmately lobed or divided. 30042019 Most ranunculus flowers are perennial but there are some species that are herbaceous biennial terrestrial or aquatic plants. Ranunculus normally starts to flower about 90 days after planting. Department of Agriculture as weedy and invasive in many states.