Thousands of years ago, comfrey was an important part of any herb garden. Today, modern gardeners and herbalists alike are rediscovering this easy-to-grow, easy-to-care-for, multi-purpose plant! Comfrey is a tall, reliable perennial in USDA Hardiness Zones 4-9. When fully mature, under excellent conditions, it can be 3-6 feet tall and 2-4 feet wide. It could …