Herbs socked away in a refrigerator are preserved, but they do lose the original freshness and some of their ability to add flavor. If you want to keep them fresh, get the slim and rather good-looking Prepara Herb Savor. The herbs are kept vertical, with their stems submerged in water contained in the base. The steel basket above is removable, and the water below can be replaced. It fits into the refrigerator’s door, and keeps your herbs fresh for up to three weeks.