Mounting a Motion-Activated Floodlight on a Pine Tree Safely

Attaching hardware to a living tree is generally discouraged, but a security light may justify an exception. Pines compartmentalize wounds well, so a few properly installed fasteners cause minimal long-term harm.

Best Hardware: Hanger Bolts

For a permanent installation, use hanger bolts (also called lag-threaded studs). One end screws into the tree trunk; the other end is machine-threaded to accept nuts that hold conduit straps and the fixture box. This allows the hardware to be adjusted as the trunk expands.

Critical Maintenance

Every two to three years, climb a ladder and loosen the nuts slightly so the tree can grow without engulfing the bolts. If the hardware becomes embedded, it can girdle the trunk and create a structural weak point. Also, run conduit along the outside of the bark—never notch or trench the trunk for wiring.