Question

different types of flowering plants have different life cycles. for example, annuals go from seed to flower in one year. these plants die after one year, but new seeds from the old plant may grow in its place the following spring. in contrast, perennials flower again every spring or summer from the same root system. the bamboo species phyllostachys bambusoides is similar to an annual in that it usually dies after it flowers but lives a long life of 120 years before it ever blooms. in addition, p. bambusoides plants do something called gregarious flowering. this means that p. bambusoides plants bloom at the same time no matter where they are located in the world. their next mass blooming is expected to occur in 2090. p. bambusoides flowers are blank rare artificial gorgeous blank

Explanation:

The text states that Phyllostachys bambusoides lives 120 years before blooming and its next mass - blooming is in 2090, indicating long intervals between blooms, so the flowers are rare.

Answer:

A. rare