Meanings of sweet brier in English

There were roses and hollyhocks like rows of sentinels, and sweet brier clambering about.

Mrs. Meadowsweet, may I run across the garden, and pick a piece of sweet brier to put in the front of my dress?

Part of this garden was planted with vegetables, and part with flowers, while many vines and sweet brier bushes stood before the cottage door.

Ethel Morton at Sweet Brier Lodge