Guidelines for storing early or late spring mason bee cocoons under different climates.

Note- these directions are for Osmia lignaria (early spring) and Osmia californica (late spring).

Choose method of storage according to your climate, winter conditions and your preference.

(1)  When winter temperatures are mostly above 23 ⁰F   (-5 ⁰C)

Set container of mason bee cocoons into a mason bee house or other wooden structure that protects cocoons from the weather, direct sun and predation.  Follow directions noted on small cardboard box with cocoons (see Beediverse.com for more detailed directions).

(2)  When winter temperatures are consistently below 23 ⁰F     (- 5 ⁰C) 

If winters are particularly severe as in eastern and central NA, mason bees can be stored inside a fridge until temperatures are no longer below (-5 ⁰C)

It is best to store cocoons inside a manual defrost fridge.  Set container of water inside fridge to maintain 60% humidity.  Every week or so check water level in container and top up if necessary.

If an automatic defrost fridge is used, place cardboard box in a sealed plastic bag or sealed container with a damp paper towel.  Set cocoons into container, but not directly in contact with the damp paper towel.  Keep temperature above freezing (34-38 ⁰F)   (2-4 ⁰C).

In late winter, when spring is a couple of weeks away, set out bees as in (1).

(3)   When winter temperatures are consistently above 40F

Mason bees need a minimum of one month at around freezing temperatures.  Refrigerate for a minimum of one month.

Note precautions in refrigeration- see notes above.

After one month of refrigeration set outside as in (1).

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