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Mason Bee Observer - 8mm Tray


Availability: In stock

Short Description

Our Bee Observer nesting trays are an easy, fun and safe way to peek into the secret life of bees.



Add our Bee Observer nesting tray to your Chalet, Cottage, or Tower bee house and watch female bees build their nests. The clear window also lets you watch mason bee larvae develop without disturbing the bees.

Mason Bee Observer - 8mm Tray: In the spring, you can watch female mason bees build mud walls and pollen loaves for each egg. When the female bees are done nesting, remove the Bee Observer and in the comfort of your home or classroom, watch the mason bee larvae eat, grow, and spin their cocoons. You can also see pests like pollen mites or chalkbrood develop.

Bee Observer Benefits:

• An educational and fun way to learn about solitary bees
• Bee Observer Drawer shades the nesting tray’s clear lid, giving bees the naturally dark nesting environment they prefer
• Wood Nesting Tray slides out easily for periodic observation
• Female bees tend to nest first along bottom edge of bee house, place Bee Observer under your favorite nesting materials to improve nesting
• Removable acrylic lid for cocoon harvest
• Designed to fit perfectly in our Chalet, Cottage, and Tower bee houses


• 1 Bee Observer Drawer
• 1 Wood Nesting Tray (8mm) with acrylic lid

Size: 1.25" H x 5.75" W x 6.25" D

To add the Bee Observer nesting tray to your homemade DIY bee house, ensure that your bee house is at least 8" deep to protect nesting tray from rain.

Additional Information

Additional Information


Mason Bee Observer Instructions:

Installation: Bees tend to nest first along the bottom row of nesting holes. Place the Bee Observer in your bee house under your nesting materials (BeeTubes with Inserts, Natural Reeds, Wood Trays), with the front open end of nesting holes facing out. The Bee Observer is designed to be used within a bee house that has a 2-3” roof to protect against rain.

Pro Tip: If female bees are already nesting in your bee house, install the Bee Observer in the evening.

Observation during nesting: To lessen disturbance of the nesting bees, observe 1-2 times a day, preferably in the evening. Gently ensure the wood nesting tray is pushed to the back of the Bee Observer drawer.

Observation during larval development: When female mason bees are done nesting (usually in late spring), remove both the Bee Observer Drawer and Wood Nesting Tray from your bee house and store in your home or classroom for easy observation. Give the bee larvae their naturally dark environment by keeping wood tray inside of drawer after observation.

Fall Mason Bee cocoon harvest: Best done from October to December. Unscrew the 4 acrylic lid screws; remove the bee cocoons with a Popsicle stick, or Phillips-head screwdriver; and clean the nesting tray with a stiff brush or old toothbrush. Treat the nesting tray for any chalkbrood or mold with a mild bleach solution or spray Clean Bee bleach alternative, allow to dry completely. When reattaching acrylic window, put screws in until just snug.  DO NOT OVER-TIGHTEN.

Pro Tip: Soak acrylic window in water for a few minutes to avoid scratching.  Rinse and wipe with a soft cloth if necessary.

Maintenance: The Bee Observer Drawer was treated with Daly's Ship'n'Shore, a non-toxic waterproofing drying agent with linseed oil.

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