Urban ornamentals escaped from cultivation.

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Prevalence of alien versus native species of woody plants in Berlin differs between habitats and at different scales. (2013, background): “Planting large numbers of non-native ornamentals usually results in a strong propagule pressure in urban regions, which is an important driver of the subsequent naturalization of these species (Mulvaney 2001, Kowarik 2005, Lockwood et al. 2005, Křivánek et al. 2006, Pyšek et al. 2009).”
Invasiveness potential of Miscanthus sinensis: implications for bioenergy production in the United States (2010, background): “Gene flow (i.e. pollen transfer) between domesticated species, including crops and ornamentals, and wild relatives can result in hybrids of variable invasiveness (Gressel, 2005; Kowarik, 2005).”