A major concern of environmentalists is the introduction of invasive species into an ecosystem. Invasive species.gov defines "invasive species" as a species that is non-native to an ecosystem ...

One of the most problematic invasive plants is English ivy (Hedera helix). Native to Europe, western Asia and North Africa, it spreads aggressively, rooting where stems touch the soil to develop ...

History in your garden: Ivy (Hedera helix) By MONTY DON FOR MAILONLINE Updated: 07:43 EDT, 8 December 2008 ...