Q. Is Equisetum hyemale invasive in a home garden in Pennsylvania?
Carolyn, yes this equisetum is very invasive in our area. Although it is not on the PA invasive species list, it is in some states. Once it is established it extremely difficult to eradicate. No wonder as it has been around since dinosaur times. It was planted years ago along parts of the Colorado River to stabilize the shore line and now it has overtaken many of the native species and continues to thwart attempts to eradicate it. I can't even suggest a subsititue for your contemporary garden. Even the "bunching" bamboo can overtake a garden without much effort. How about an upright evergreen such as the holly Ilex 'Skypencil'?