Home Sweet Home-Providing the Perfect Habitat for Mason Bees

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A bee house mad out of stacked pallets

Custom Condo

Attracting bees with the right plants is important, but what about inviting them to make a home nearby with attractive ready-to-move-in housing? A custom condo became my project in the winter for solitary mason bees, otherwise known as orchard bees, because they are excellent at pollinating fruit trees.

Natural habitat for wild bees from www.wildbienen.com
Natural habitat for wild bees from Wildbienen

Curb Appeal

Mason bees start looking for homes in early spring so I wanted to have it in “move in condition” with lots of curb appeal  in early March. They use clay to make partitions and seal the entrance to their nesting tubes. This unique building behavior leads to their common designation as masons.

Mason Bees, from Wikipedia
Mason Bees, from Wikipedia

When I did my research on solitary native mason bees, I discovered to my surprise that they are a much more efficient pollinator than the social honey bees which were originally imported from Europe with the colonists. Mason bees are one of the few managed native pollinators in agriculture because of this terrific pollinating ability.

Go to https://www.etsy.com/shop/TheGardenDiaries
Go to https://www.etsy.com/shop/TheGardenDiaries

If you would like to help bees, you can participate in their Indiegogo campaign and you can contribute and get your own mason bee kit, become a bee booster, or adopt a bee. Crown Bees is raising money and awareness with their effort.

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Mason bee on apple blossom, from Crown Bees
Mason bee on apple blossom, from Crown Bees

 

Differences Between Mason & Honey Bees

Mason bees are about the same size or slightly larger than a honeybee and color is your best way to tell them apart.They are a dark metallic blue, not striped brown and orange like the honeybee.  Being solitary, the mason bee tends to its own brood, instead of having a queen and worker bees like the social honey bee. They seem to appreciate the company of others of their kind and happily build their nests next to each other. They also readily accept the hollow tubes provided by the orchard grower for this purpose. Mason bees don’t produce honey like the honey bee, but collect pollen and nectar just like the honey bee for feeding their young.

 

Tubes in a nesting box
Tubes in a nesting box

Home gardeners can attract mason bees in their own gardens by placing home-made bee houses and blocks in their own yards. Scroll down to see my version of a DIY house for mason bees.

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Life Cycle

Unlike the honey bee, the mason bee flying season is early spring because they can tolerate lower temperatures. The honeybee will only fly when it reaches the 50’s, but the mason bee flies in the 40’s. Once a mason bee emerges from their over wintering tube, they mate, search for empty holes that are the right size and shape, and start to work. They collect food for their brood, which is tree pollen plus nectar. Females collect this food, bring it to their nests, and knead it into a ball, mixing it with nectar and their own saliva. Once they have a food store that is big enough, they lay an egg on top of this mass and seal-off the chamber or cell with mud.

Mason bee egg surrounded by food stores of pollen and nectar, Wikipedia
Mason bee egg surrounded by food stores of pollen and nectar, wikipedia

Then, they start the process all over again until there are five to eight eggs each with food, each separated by a thin wall of dried mud. They seal the entrance to the hole with a thicker mud wall. The larvae grow and, by the end of summer, metamorphose into pupae and later into adults, and remain safe and sound inside the nest in a cocoon until the next spring. The new generation emerges the next spring, usually in perfect timing with the blooming peach or apple trees.

Mature mason bees break through the mud wall
Mature mason bees break through the mud wall
Bumble bee on Azalea blossom
Bumble bee on Azalea blossom

 

Nesting House Basics

You can make suitable nesting sites with readily available materials. The web site http://www.wildbienen.info/index.php, a German website is excellent. There are lots of examples of wild bee houses on this site. Since many wild bees are sedentary, residing where they originated, they will stay nearby, provided there are suitable nesting sites. The greater the variety of species and population density in the area, the faster colonization.

Pollinator house from www.wildbienen.com
Pollinator house from www.wildbienen.com

Location, Location, Location

For locating your house, look for a south or westerly facing aspect to make full use of the morning sun. Protected from wind and rain by locating the house under a roof, will increase your chances of  bees and other insects of moving in. A ready source of uncovered soil for the mason bee to use as mud in sealing the eggs, is also important as well as proximity to floral sources. For help in planting the right plants, go to Plant These For Bees.

How to site a bee house
How to site a bee house

 Easy DIY Mason Bee House

Mason Bee House
Mason Bee House

For an easy mason bee habitat out of wood, I created this simple box with a roof out of cedar wood. The house measures 18″ x 22″ high with a peaked roof, 6″ high. The depth of the house is about 4″. I took an untreated 4 x 4 timber and cut it into chunks the depth of the house, and drilled holes into the blocks of different diameters. The various sized holes give pollinators a choice in picking out the most suitable hole for their species. This house would be appropriate for different varieties of native bees. The back was just a piece of plywood to give the house stability.

 Move In Day

Filling in all the spaces with lotus pods, pine cones, and hollow stems of sunflowers that I cut down from my garden last year took some time. Topping it off with plastic covered hardware cloth, the bee condo was ready to hang and open for business.

Completed mason bee house attached to a shed
Completed mason bee house attached to a shed

Tubular Housing

Tubular is the main feature that mason bees are interested in. Finding something round is critical for their success. I keep looking for tubular shaped objects that I can use in future housing projects.

Wood blocks with grooves for egg laying bees
Wood blocks with grooves for egg laying bees

Wooden blocks that split apart revealing the cocoons made by the pupae of the bees for harvesting are simple but effective. Easy tear tubes made of paper are convenient to use but once you tear them apart, that is the end of them.

Easy tear tubes with cocoons revealed
Easy tear tubes with cocoons revealed

Go to www.crownbees.com to browse ready-made houses and tubes, if you don’t have time to build from the ground up. You can also get an attractant pheromone that will be sure to entice the mason bees to nest in their new home. The site is also a wealth of information about many native bees.

Mason bees are gentle, from Crown Bees
Mason bees are gentle, from Crown Bees

Crown Bees recommends that once summer is over, that you harvest the mason bee cocoons and place them in a humidity tray with a moist cloth in your refrigerator to keep conditions right for surviving until next spring.

Humidity box for overwintering cocoons in the refrigerator
Humidity box for overwintering cocoons in the refrigerator Photo by Dr Margriet Dogeterom of BeeDiverse

When warmer weather rolls around, bring the humidity tray outside in the warmer air and wait for the cocoons to hatch and release the bees. I ordered some cocoons from them and a few hatched in transit which I released outside when they came.

 

Mason bee hatched out of cocoon
Mason bee hatched out of cocoon

There are many other strategies that you as a homeowner can do to help out with our pollination crisis. See my action plan outlined at Sex in the Garden.

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Go to Etsy to purchase

11 Replies to “Home Sweet Home-Providing the Perfect Habitat for Mason Bees”

  1. Hi, Claire — Love this post! The bee houses are amazing. We are pollinator fanatics and will post a link on our FB page. Happy spring! — Ann & Liz, Green Heron Tools

  2. I did not know about Mason Bees so I have been thoroughly educated. What a wonderful idea. So many people are afraid of bees and being stung by them that building them housing isn’t an option. I don’t have much sun for awhile but kept my dandelions in the back yard. Hoping the neighbors don’t turn me in. They want all weeds gone at all costs including the use of roundup. I won’t use it and told them so. It’s sad that so many are brainwashed. I love the houses.

  3. Excellent article and very timely! I just put out a newly refurbished mason bee house last weekend and I have a few more to get ready. It seems late in the year, but I’m hoping the prolonged cold spring will mean the bees are slow to stir.

  4. Great site … I am just starting a Mason Bee “Condo” & am using some of the ideas from your site … Hopefully I can attract the little darlings & get my garden pollinated to boot.

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