Gardens, as anyone who’s blown a weekend tending an overgrown and weed-filled yard can attest, do not take care of themselves. At least not usually. A new project in Milan offers a vision of a garden that can water and light itself, all by harvesting the energy of the people who come to visit. [Photo: Marco Beck Peccoz/courtesy CRA-Carlo Ratti Associati] “Feeling the Energy” is a temporary installation at Milan’s botanical garden that employs a range of renewable energy sources to power the garden. Co-designed by Milan-based CRA-Carlo Ratti Associati and architect Italo Rota, the installation features a winding copper tube that bends and flows through the entire garden, serving…