We have a tendency to consider salads as spring and summer affairs, however fall is when salad greens actually begin to shine. Gardeners know this effectively. Many lettuces and dark leafy greens, together with spinach, watercress, arugula, kale, romaine, bok choy and radicchio, thrive in cooler months. The nippiness within the air helps tame their bitterness, so the astringency of arugula turns right into a bewitching pepperiness, and the harshness of kale is offset by a verdant vegetal tang.