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What Are the Functions of Flower Bracts?

By Laura Reynolds ; Updated September 21, 2017

Many perennials we grow in our gardens have “insignificant inflorescence,” or tiny flowers that grow in a center surrounded by modified leaves called “bracts.” Often we grow a plant not for its flowers but for its bracts.

Protection

The primary task of a bract is to protect the inflorescence. Some, like the stinking passionflower, exude a substance that repels grazers. Others have bristles. They may look like a leaf, part of a flower or, like Euphorbia (spurge), part of the plant.

Shelter

A large, often graceful bract known as a spathe surrounds or encloses a flower cluster, or spadix, in calla lilies, jack-in-the-pulpits and peace lilies.

Attraction

Large or colorful bracts surround flowers to bring their attention to specific insects. Poinsettias and sunflowers have bracts that signal pollinators with bright colors or provocative (to bugs) shapes.

Recyling

The stiff bracts on strawflowers and paper daisies are actually dead tissue reused to surround flowers. They often remain long after the seeds have dispersed and are used as dried flowers.

Imitation

Bracts may imitate the sepals, or calyx, of a flower. In carnations and hibiscus, this adds strength to areas surrounding the ovule, the part of the flower where seeds develop.

 

About the Author

 

An avid perennial gardener and old house owner, Laura Reynolds has had careers in teaching and juvenile justice. A retired municipal judgem Reynolds holds a degree in communications from Northern Illinois University. Her six children and stepchildren served as subjects of editorials during her tenure as a local newspaper editor.