Consider the lovely and ubiquitous English ivy.With its shiny, heart-shaped leaves and readily trailing vines, it has served faithfully as a ground cover and fence-climber for generations. And with good cause " it's both lovely and rugged. It will thrive with limited water, on poor soils, in sunlight or shade and is resistant to disease, insects and animals. Once established it requires little attention, just occasional trimming to keep it within its intended boundaries.And therein lies the problem. Eventually, most landscaping features get left untended. Many plants die without care, but English ivy goes feral. It spreads with the determination …