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 study of Mercer Island forests shows invasive tree seedlings outnumber sprouting native trees 9 to 1. A study in St. Edwards State Park has 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 unchecked spread of English holly and ivy in regional forests could have detrimental effects on native flora and fauna, potentially affecting timber, fishing, agriculture, and recreational industries.