Purple Sweet Potato: Types, Benefits, and How to Cook It
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What Makes a Sweet Potato Purple
Orange sweet potatoes get their color from beta-carotene, which your body converts into vitamin A. Purple ones get theirs from anthocyanins, a group of antioxidant compounds. Both are pigments doing double duty as nutrients, but they are entirely different compounds, which is why the nutrition profiles of purple and orange varieties are not interchangeable.
The Main Types (and One Impostor)
| Variety | Skin | Flesh | Notes |
|---|---|---|---|
| Okinawan | Tan or beige | Vivid purple | Sweet, dense. Grown in Hawaii and Japan. |
| Stokes Purple | Deep purple | Deep purple | Grown in North Carolina. Drier, earthy, less sweet. |
| Murasaki | Purple or reddish | White or cream | Purple skin only. Nutty and sweet inside. |
| Ube | Brown, rough | Bright purple | Not a sweet potato at all. It is a true yam. |
That last row trips up a lot of people. Ube is not a purple sweet potato. It is a different plant entirely, a true yam widely used in Filipino desserts like ube halaya and ube ice cream. The two are not swappable in recipes: ube is starchier, more fibrous, and much more floral in flavor.
Purple vs. Orange Sweet Potato Nutrition
| Per 100g, cooked | Purple | Orange |
|---|---|---|
| Calories | ~90 to 105 | ~86 |
| Fiber | ~3g | ~3g |
| Vitamin A | Very little | Very high |
| Signature antioxidant | Anthocyanins | Beta-carotene |
| Texture | Drier, denser | Moister, softer |
| Sweetness | Milder, nuttier | Sweeter |
Neither one is the winner. If you want vitamin A, orange is the clear choice. If you want anthocyanins, purple is. Eating both is the sensible answer. For the full nutritional breakdown of the orange kind, see our complete guide to sweet potatoes.
How to Cook Purple Sweet Potatoes
The flesh is drier and denser than an orange sweet potato, so it behaves a little differently in the oven:
- Roasting concentrates the flavor but can dry it out. Rub with a little oil and cover for part of the time.
- Steaming is the gentlest option and does the best job of preserving that purple color.
- Boiling works, but some of the pigment leaches into the water and the color dulls.
- Expect a longer cook time. Denser flesh means it usually needs an extra 10 to 15 minutes compared with an orange one.
Frequently Asked Questions
Is ube the same as purple sweet potato?
No. Ube is a true yam from a different plant family. It looks similar once cut open, but it is starchier and has a distinctly floral flavor.
Are purple sweet potatoes healthier than orange ones?
They are different rather than better. Purple varieties supply anthocyanins, orange ones supply a large amount of beta-carotene for vitamin A. Both bring fiber and potassium.
Why did my purple sweet potato turn blue or green?
Anthocyanins shift color with pH. Alkaline ingredients like baking soda can push them toward blue or green. A squeeze of lemon juice brings the purple back.
Do purple sweet potatoes taste different?
Yes. They are typically less sweet, drier, and nuttier, closer in character to a chestnut than to a candied yam.
Prefer Yours Chewy?
Whatever color you cook at home, our chewy dried sweet potato sticks give you the whole vegetable in a form that fits a bag or a desk drawer: real sweet potato, 4g of fiber and 3g of protein per serving, naturally vegan and gluten-free, never deep-fried. If you like exploring varieties, you might also enjoy our posts on the Korean sweet potato and the Japanese sweet potato.