Bee Pollination

Bees are the champion pollinators!

bee on a yellow flower.
Photo by Beatriz Moisset, 2002-2004.

In the United States, there are over 4,000 species of native bees. Familiar bees visiting garden flowers are the colorful, fuzzy, yellow-and-black striped bumblebees, metallic-green sweat bees, squash bees, and imported honeybee. These flower-seeking pollen magnets purposefully visit flowers to collect pollen and nectar for food for themselves and their young.

Energy Needs

All bees have very high-energy needs that must be met for their survival. Bees need key resources such as pollen and nectar from a variety of flowers. Bees need these resources for themselves and their progeny. Many bees need water in addition to nectar.

Nesting Habitat

bee on an orange flower.
Photo by Beatriz Moisset, 2002-2004.

Bee nesting habits vary greatly. For example:

  • Mason bees construct nests from mud.
  • Leafcutter bees use a "wrapper" of leaves, resin and sand.
  • Carder bees harvest plant fibers.

Most bees excavate their nest tunnels in sunny patches of bare ground, while others seek out abandoned beetle burrows in dead tree trunks or branches. The majority of bees are solitary, but a few, like sweat bees, bumblebees, and honeybees, are social, living in colonies that consist of a queen, her worker bee daughters and a few males, the drones.

Bee Flowers

carpenter bee on a pink flower.
Photo by Beatriz Moisset, 2002-2004.

The flowers that are visited by bees are typically:

  • Full of nectar
  • Brightly colored with petals that are usually blue or yellow or a mixture of these (bees cannot see red)
  • Sweetly aromatic or have a minty fragrance
  • Open in daytime
  • Provide landing platforms
  • Often bilaterally symmetrical (one side of the flower is a mirror image of the other)
  • Flowers are often tubular with nectar at base of tube

bee flying to a snapdragon flower.
Snapdragon and bee. Photo by Grant Lau.

An example of a bee-pollinated flower is a snapdragon or Penstemon (pictured right). Snapdragon flowers have sturdy, irregular shaped flowers with landing platform. Only bees of the right size and weight can trigger the flower to open. Other bee species or other insects that are too small or too large are excluded.

Nectar Guides

Many of the flowers pollinated by bees have a region of low ultraviolet reflectance near the center of each petal. This region appears invisible to humans because our visual spectrum does not extend into the ultraviolet. However, bees can detect ultraviolet light. The contrasting ultraviolet pattern called a nectar guide. This guide helps a bee quickly locate the flower's center.

This adaptation benefits both the flower and the bee. The bee can more rapidly collect nectar and the flower is more effectively pollinated.

flower as humans view it. A black and white view of the flower.
As humans view it!

A the flower as bees may view it. A less detailed black and white image. The centers of the flower are dark.
As bees view it!

Photos courtesy of Apalachicola National Forest.

Fun Fact

bee on a yellow flower.
Photo by Beatriz Moisset.

Many insects such as flies and wasps mimic true bees. True bees have two sets of wings. Flies have only two wings. Wasps although they look like are only closely related to bees. Next time you see a pollinator in your garden check to see if it is a bee.

Here is a web site that can help you: Is it or isn't it a bee?

For More Information

bee on a purple flower.
Photo by Grant Lau.

For more information about bees, building bee habitat, or bee gardens visit the following links:

Bumblebee Conservator - Volume 2, Issue 1: First Half 2014

Bumblebee Conservator cover page.

Posted April 3, 2014

Welcome to the second issue of the Bumblebee Conservator, the official newsletter of the Bumblebee Specialist Group. Currently, the plan is to produce and distribute the newsletter twice a year. This first issue of the year will include the Annual BBSG Report along with additional articles.

See the newsletter (PDF, 2.9 MB)…

Native Wildflowers and Bees of Western Montana

Cover page of Native Wildflowers and Bees of Western Montana.

Many of us enjoy the beauty of wildflowers, but we may not know their names or how to identify them. This basic guide will help you identify sixteen pairs of common native wildflowers and bees of western Montana that provide vital pollination services. In this this guide, a bee is paired with a flower it is most likely to visit, but it may visit other flower types as well. From early spring through the fall, look for these wildflowers and bees as you walk along forest and grassland trails.

This brochure was prepared and published by the U.S. Forest Service Lolo National Forest, Missoula, Montana. Text is by Susan Reel, design and native plant illustrations by Nancy Seiler, and bee illustrations by Steve Buchanan.

Native Wildflowers and Bees of Western Montana (PDF, 3.8 MB)

Conservation and Management of North American Bumble Bees

Bombus vagans.
Bombus vagains. Photo by Sheila Colla.

This is a report of the USDA Forest Service and NatureServe with funding from the National Fish and Wildlife Foundation. This document provides a brief overview of the diversity, natural history, conservation status, and management of North American bumble bees, genus Bombus. The spring to late summer period of colony founding, build up, and production of reproductive individuals, followed by the overwintering of new queens provide the natural history basis for management considerations of the approximately 46 North American species. Most bumble bee species are currently not threatened or documented as declining except in areas of intensive agriculture. Eight species from three subgenera, however, have declined drastically during the last 15-20 years. These include three species that are obligate parasites on other declining species. The pathogen spillover hypothesis, which proposes that diseases from infected commercial colonies imported from Europe are infecting native populations of closely related species, may explain the sharp declines of most species. Other threats to bumble bees include climate change, loss of nesting and foraging habitats and pesticide use.

Schweitzer, D.F., N.A. Capuano, B.E. Young, and S.R. Colla. 2012. Conservation and management of North American bumble bees. NatureServe, Arlington, Virginia, and USDA Forest Service, Washington, D.C.

Read the report (PDF, 2.8 MB)…

Bumblebees of the Eastern United States

Bumblebees of the Eastern United States Poster.

Twenty-one species of bumble bees (Bombus spp.) occur east of the 100th meridian. This poster made available by the Pollinator Partnership, depicts the bumble bee species occurring east of the Mississippi River in the United States.

Art and Design: Steve Buchanan

Download Print Size Version (PDF, 68.5 MB)

Download Reduced Size Version (PDF, 1.4 MB)

Bumblebees of the Western United States

Bumblebees of the Eastern United States Poster.

Bumble bees (Bombus spp.) are vitally important pollinators of wild and managed flowering plants. In the contiguous United States 30 species of bumble bee are found west of the Rocky Mountains. This poster made available by the Pollinator Partnership, depicts the bumble bee species occurring west of the Mississippi River in the United States.

Art and Design: Steve Buchanan

Download Print Size Version (PDF, 16.1 MB)

Download Reduced Size Version (PDF, 4.4 MB)