Why Cottonwood Fluff Is a Roswell, NM Gutter Problem
Cottonwood trees are common in Roswell and across Chaves County neighborhoods. In late May and June they release a white seed fluff that drifts through the air, settles on roofs, and collects in gutter channels just before monsoon season begins.
Cottonwood fluff is roughly the right diameter and texture to lodge in a standard 2x3 inch downspout opening. It is light when dry, but once it is moistened by dew, a sprinkler overspray, or an early rain, it compresses into a fibrous plug that can seal the opening completely.
That is why a downspout can look fine from the ground but stop moving water during the first hard July storm.