Here's a list of plants to avoid if you want to call your garden easy. This invasive ground cover is almost impossible to eradicate once you have it in your garden. It may look fine in a Japanese garden, but the birds love the berries, which they then spread all over the place. It is impossible to eradicate. This plant's taproots go down to China.
Highway departments plant the stuff to prevent erosion on embankments.
It is best left there, not in your garden. This tall, graceful plant is just too selective. It wants more sun, less sun, more water, less water, it's too cold, it's too hot. It smells good, but its vines spread like kudzu, taking over woodland areas and smothering native plants that are more beneficial for wildlife. Another invasive ground cover, mint can take over a garden spot in one year, and the tiniest piece left behind will send forth another batch of plants.