Why did English bluebells (Hyacinthoides non-scripta) sprout uninvited in a small city yard in Pittsburgh? Because life is better than we deserve.

Garlic Musard (Alliaria petiolata) is one of those invasive weeds that make forest-lovers see red, although more recent studies suggest that its ill effects on our woodlands have been exaggerated. It does have two advantages: first, it has pretty white flowers; and second, you can eat it. It came to this country because it was a tasty and nutritious vegetable.