03/12/2026
Those holes in your deck aren't damage. Each one took a single bee six days to build. By mouth.
Perfectly round. Exactly half an inch. Every one identical. You found them on the railing, the pergola beam, the underside of the porch stair. You assumed something was destroying your deck. Something is building in it.
A female carpenter bee chews into untreated wood by vibrating her mandibles against the grain faster than a hummingbird beats its wings. She cuts a hole exactly her body width, enters straight for about an inch, then turns ninety degrees and tunnels with the grain for six to ten inches.
Inside that tunnel she constructs separate rooms. Each room gets one egg and one ball of pollen mixed with nectar. She walls off each room with a plug of chewed wood pulp. Then she seals the entrance. Then she dies. The babies hatch in June, eat the pollen ball, chew through the plugs one at a time, and emerge into summer as full adults. They never meet their mother.
She is not a termite. Termites eat wood. Carpenter bees excavate it. The sawdust on the ground is construction debris, not structural damage. One tunnel per year in a deck board causes no meaningful weakening. You'd need dozens in the same board over many years before it mattered.
That large bee hovering inches from your face and following you around the porch — that's the male. He has no stinger. He cannot sting. It is physically impossible. He's territorial and loud and completely harmless. The female can sting but almost never does — she's inside the tunnel working and you'd have to physically grab her.
She pollinates your tomatoes, peppers, blueberries, and squash. Carpenter bees are among the most effective pollinators for garden crops because they vibrate flowers at a frequency that releases pollen other bees can't reach.
🐝 If you want the bees without the holes:
- Paint or stain exposed wood — carpenter bees avoid treated surfaces almost entirely. This is the most effective prevention and it protects the wood from weather at the same time
- Provide a bee block — drill half-inch holes three to four inches deep in a scrap log or untreated lumber post and mount it near the deck. She'll use it instead of your railing
- Plug old holes with steel wool in September after the babies have emerged — not before, or you trap the next generation inside
- The male hovering in your face is doing the only thing he can do — look intimidating. Walk through him. He'll follow for a few seconds and give up
Every one of those perfect holes is a six-day construction project built by an animal with a brain the size of a sesame seed 🌿
