Three Things That Clog Gutters

1. Leaves

Maples drop first in the fall; oaks hang on and keep dropping into November and beyond. Wet leaves mat together into a dam that holds water, adds weight and pulls gutters loose.

2. Pine needles

Needles fall year-round, slip through basic screens, and knit together into a mat that blocks outlets and downspouts. Homes under white pines often need an extra cleaning or fine micro-mesh guards.

3. Shingle grit

Asphalt shingles shed granules, especially as they age. The grit settles in the gutter like sand, mixes with leaves into sludge, and helps seeds take root.

Plus: seeds, pollen and nests

Maple seeds and pollen in spring, and the occasional bird's nest, finish the job. Plants growing out of a gutter are a sure sign it's overdue.