The inhabitants of our cities have undoubtedly come down with a gardening virus. Gardening is being propagated as the new sex. Wherever one looks, a gardening euphoria is in bloom. We only have to think of the riverbanks restored to their natural state, the urban gardening and urban farming projects springing up all over the world, the green skyscrapers (prospective and actually built) such as, for instance, the utopian farmscrapers of Vincent Callebout, the conversion of former high rail lines into green recreation spaces, the meditation gardens of Piet Oudolf, and the vertical gardens of Patrick Blanc.