Large, elegant perennial vegetable plants grow from this thistle. Artichokes' edible flower buds open to show fuzzy purple petals if not picked.
Garden stores and internet retailers sell rooted asparagus crowns. In early spring, dig trenches 6 inches deep in clay soil or 8-10 inches deep in sandy soil a month before the last frost.
Jerusalem artichokes (Helianthus tuberosus, often called sunchokes) are produced like potatoes for their underground tubers. They can be eaten raw or cooked like potatoes.
Fall-planted bunching and Egyptian onions grow new onions after harvesting. Grow all onions in well-drained, organic-rich soil in full sun to light shade.
Hardy biennials like this sharp-flavored vegetable thrive for two years. It's chicory, like Belgian endive. A densely clumped head of dark red leaves with white veins resembles cabbage or romaine lettuce.
Since you consume the stems, rhubarb (Rheum rhabarbarum) is a hardy perennial vegetable that many people mistake for a fruit. Rhubarb needs full sun and well-drained soil. It can produce for years, so put it somewhere quiet.
A perennial herb with a tangy, lemony flavor, sorrel is used in soups, stews, salads, and sauces. Common and French sorrels are grown most often.