be in flower

A single bower may be in flower for a month, and extravagantly even for a rose, but those attributes don’t wash for consumers programmed for ever-blooming roses.

To produce or yield blossoms; to blossom; to flower or be in flower.

And when you come back, darling, you'll find your son, perhaps, and the hepaticas may be in flower, waiting for you.'

It had no right to be in flower now.

"Dear me," said the Rath, "what may that be in flower there?"