
This is a nest for mason bees or leaf-cutter bees, gentle, solitary, non-aggressive bees who stick close to home. They estimate about 3500 species in North America and account for 80% of flora fertilization.
For images:
Osmia lignaria lignaria
Mason bees
About Pollen Bees
- Pollen bees only live 6 - 8 weeks They spend their lives collecting pollen and nectar for their eggs in the chosen nest
- They lay eggs until the nest is full
- They lay 6 - 8 eggs
- fertilized female eggs in the rear, 2 - 3 unfertilized males eggs in the front
- The eggs hatch in several week, after which the larvae consumes the pollen and nectar
- They metamorphose into an adult bee, emerging the following year
- the female in the rear wakes first, males mate with females and die
- The process takes about 12 months
- Pollen bees can create nests in burrows, or in plant stems, or holes in trees
![]() |
Bumble Bees are at risk from predators, like goldenrod spiders! |
![]() |
honey bee |
![]() |
They provide two nails, which doesn't fit into the 'holes!' |
![]() |
A bit wobbly on a round stump! |
At first, I tried to attach it to a tree stump, but it didn't seem to be that well-placed. It jiggled on the rounded surface! On the wall works well. I happened to be in front of it when a mason wasp visited. Not what I wanted, but what can one do?! With the decrease in bee species world-wide, I'll take any comer!
They suggest putting the stickers on the outside once the hole is full. This is to prevent predators and moisture from entering.
![]() |
There is an info sheet, with a tracking system for dating the egg placement! |




My beekeeper friend tells me this is a Mason Wasp. I guess they will find themselves a home here, too! It shows them going in and out, however!
Mason Bee House from Jennifer Jilks on Vimeo.