Las Pilitas Nursery

California Native Plants are all we grow!

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3232 Las Pilitas Rd
Santa Margarita, CA 93453

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This website is dedicated to Bert Wilson. His genius continues to inspire us.

Mason Bees

Mason, blue orchard or Metallic leafcutter bees, Osmia are very competent pollinators. One of the Cherry Orchards in Utah found a 300% increase in yield when they switched from European honey bees to Blue Orchard Bees (in How to Manage the Blue Orchard Bee by Bosch and Kemp). These little buzzers are about half the size of Honey bees but their brain seems bigger and they'll work the flowers on cloudy days and earlier in the morning and later in the evening. They build their nests in cracks in rocks, mud or woody material.They plug the nest entrance hole with leaves and then with mud.
Mason bees do have stingers but only use them to defend themselves from things like dumb human hands squishing them.
If you have a garden or an orchard and want to attract these little bees, plant some early-season flowering plants Arctostaphylos glauca or 'Austin Griffin' manzanitas to provide food for them before your crop flowers, and some late-season flowering plants, Salvias to provide food for them, when hardly any crop plants are flowering. This way you can build up their population, and keep them alive and thriving all year round, and they will repay your effort by helping to increase your crop yields in your garden or orchard.
Mason bee resting in sun on manzanita flower - grid24_12
Mason bees are greenish or blackish metallic fuzzy bees.

Mason, blue orchard or Metallic leafcutter bees, Osmia come in many flavors and colors.

A Mason Bee on Mama Bear manzanita - grid24_6
The early manzanita flowers sustain the Mason Bees before the main crops come on.
Osmia, Mason Bee on Sentinel manzanita - grid24_6
Osmia, Mason Bee on Sentinel manzanita
An Osmia, Mason Bee, Leaf cutter bee in action working on an Arctostaphylos stanfordiana. - grid24_6
A Leaf cutter bee in action on a Arctostaphylos stanfordiana stanfordiana
A hoovering Mason Bee, Osmia - grid24_6
A hoovering Mason Bee, Osmia
What a cute little green bee. Osmia a Mason Bee - grid24_12
A Mason bee, Osmia, on Monardella. It was a really hot day and this little bee was landing on the ground, bouncing up and landing again. Finally landing on a flower for a drink of nectar.
The Mason bee is in green one. The Beefly is the fuzzy hover one. Neither are any bother for us, we we bother them if we get too close. Both were pollinating  manzanita  flowers. - grid24_12
Many of the bees have a being relationship with other bee, The Mason bees seem to get alone with everyone.