First observation in the wild:	1885
Invasion stage:	spread
Spatial distribution:	restricted

Reproduction in the wild:	yes
Dispersion potential:	likely
Natural habitats:	high

More on invasiveness: Cornus sericea is mostly found on moist to humid eutrophic soils, where it can live with the roots submerged in water for most of the growing season. It thrives in early successional stages of riparian swamps and woodlands, but also in the understorey of open forests, along forest margins, in meadows and ruderal habitats. The plant is able to tolerate extremely cold temperatures. It is autosterile and pollinated by insects. Seeds, that are primarily dispersed by birds, have a double dormancy that needs both cold stratification and passage through bird gut to germinate. As it is commonly used as an ornamental and planted in gardens and public green areas, human also contribute to the dispersion of this shrub. It is increasingly observed in the wild, most of the time obviously as an escape from cultivation.

Predation / Herbivory:	low
Competition:	high
Disease transmission:	low
Genetic effects:	low

Nutrient cycling:	unknown
Physical alteration:	high
Natural successions:	high
Food web alteration:	low

More on impacts: In open conditions, Cornus sericea has a very high growth rate and produces abundant flowering. It can quickly cover high surfaces and make a dense canopy, which reduces the development of native vegetation, strongly decreases plant species richness, reduces tree seedling establishment and inhibits succession development. Density can exceed 100 000 stems per hectare. Under a closed canopy, the plant doesn't produce flower but emits long and horizontal axes that root and give rise to many stocks. This allow it to achieve great lateral exploration and to migrate to a more favourable area or to wait until opening occurs. It is considered as a weed in the floodplains and in forest openings of its area of origin.

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