Whatever your bent, don't even think about grabbing clippers and picking forests and parks clean. "You can't just do it. You have to have permission or a permit, unless it's your own garden," says Hatter, who teaches "incredible edibles and traditional medicinals" at the University of Tennessee's Smoky Mountain Field School.
Floral designers, and gardeners, for that matter, have long improvised with homegrown stuff.
Collingswood florist Michael Bruce recently raided a client's garden for a last-minute bridal bouquet. He used fresh figs, lavender, rosemary, sage, lemon balm, liriope, and two nasty invasives: porcelain berry, which nonetheless has outstanding purple berries, and Japanese knotweed, which has arcs of creamy white flowers.