If you’re building a list of vegetables that start with O, you’re in for a flavorful surprise. From earthy root vegetables to leafy greens and culinary vegetables used in Asian cuisine, this list contains vegetables only—no fruits, herbs, or other plant foods.
These O-named veggies are more than just trivia question answers (although they’ll work for trivia, crossword puzzles, and homework assignments, too!). They add sweet flavor, peppery taste, and a hint of earthy goodness to everything from salads to hearty, savory dishes.
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10 Vegetables That Start With O
1. Oakleaf Lettuce
A leafy vegetable with soft, lobed leaves and a mild flavor, oakleaf lettuce is often used in salads or sandwiches. It grows well in well-drained soil and supports a balanced diet with its fiber and vitamin content.
2. Oca
This South American root vegetable looks a bit like a stubby fingerling potato. It packs a tangy flavor that turns buttery when cooked. Oca is a staple in Andean cuisine and an interesting alternative to sweet potatoes.
3. Ogonori (Ogo)
This edible red seaweed—technically a sea vegetable—has a chewy texture and is often used in Asian cuisine like poke bowls. Ogonori is rich in minerals and works well in other savory recipes or green salads.
4. Okra
A culinary vegetable that’s technically a flowering plant, okra is used in Mexican and Indian cuisine. It adds flavor to dishes like stews and curries while delivering a good dose of dietary fiber.
5. Onion
Onions are a culinary staple in many cultures. A member of the allium family of plants, onion brings everything from mild sweetness to sharp bite depending on the variety and how it’s cooked. It’s often used in pasta dishes, soups, and roasted dishes.
6. Orach (Mountain Spinach)
Orach is a hardy leafy green that thrives in warmer climates. Its salty, spinach-like taste adds flavor to salads, quiches, and other dishes.
7. Orange Bell Pepper
This orange veggie is rich in vitamin C and has a crisp-yet-juicy flesh that’s perfect for grilling, stuffing, or chopping into a fresh veggie platter.
8. Oyster Plant (Salsify)
This unusual root vegetable has a nutty flavor and creamy texture when roasted. Some say it has a subtle oyster-like taste. Add it to winter squash recipes or mash it like potatoes for an interesting side dish.
9. Okinawan Sweet Potato
This root vegetable with deep purple flesh and a sweet, nutty flavor is popular in Japanese and Hawaiian dishes. Rich in antioxidants, it’s excellent in baked dishes or served as a healthy snack.
10. Orange Cauliflower
A cousin of the regular white variety, orange cauliflower contains extra beta-carotene, which produces its sunny color. It has a mild taste, cooks quickly, and makes a colorful addition to vegetable platters or roasted vegetable medleys.
From Okinawan sweet potatoes to oakleaf lettuce, these vegetables that start with O offer bold colors, distinct textures, and a wide range of health benefits. Whether you’re roasting or sautéing them or tossing them into a salad, they can bring flavor to dishes and variety to your plate.
👉 If you’re looking for other vegetable and fruit “Starts with” lists, we’ve got those, too! Check out our Ultimate A-Z Index of Vegetarian-Friendly Lists.
