Seed Rain n. 1. The deposition of seeds spread by bird, wind, humans, and animals, usually pertaining to non-native invasive seeds degrading natural ecosystems. 2. “Seed rain” describes the spread of vegetative or seed propagules crossing public and private property boundaries.
Invasive Update: A 2014 study in St. Edwards State Park found that English holly is doubling every six years, having "the potential to become a dominant species in both number of individuals and area covered within a few decades, transforming the region’s native forests on a large scale“ (Dr. David Stokes, UW Bothell). The near-exponential growth of English holly in suburban forests will likely slow down in less fragmented regional forests. However, the continued spread of holly and ivy will degrade our region's native flora and fauna, including pollinators, potentially affecting agriculture, timber, fishing, and recreational industries.