Purple Tannia (Xanthosoma violaceum), also known as purple yautía or blue taro, is a striking variety of Xanthosoma distinguished by its vivid violet-purple corm flesh and dark purple-tinged petioles. While botanically closely related to common tannia (X. sagittifolium), its dramatic purple coloration sets it apart both visually and nutritionally — the deep purple flesh is rich in anthocyanins, powerful antioxidants that give this tropical root crop an extra nutritional dimension.
• Distinguished from common tannia by the vivid purple coloring of its corm flesh and leaf stalks
• The purple pigmentation indicates high levels of anthocyanins, the same antioxidants found in blueberries
• Sometimes classified as a variety of X. sagittifolium rather than a separate species
• Known as "malanga morada" (purple malanga) in the Spanish Caribbean
• The purple flesh retains its color when cooked, creating visually striking dishes
• Cultivated since pre-Columbian times in the Caribbean and Central America
• Widely distributed throughout the tropical lowlands of Central and South America
• Particularly important in the Dominican Republic, Cuba, Puerto Rico, and coastal Colombia and Venezuela
• Introduced to West Africa and tropical Asia through historical trade routes
• Often grown alongside common tannia in traditional mixed planting systems
• Less commonly cultivated than X. sagittifolium but prized in specific regional cuisines
• Genetic diversity is highest in the Caribbean and northern South American region
Leaves:
• Large, sagittate (arrowhead-shaped), 40 to 90 cm long
• Dark green blades on long petioles
• Petioles are dark purple to greenish-purple, a key distinguishing feature from common tannia
Corms:
• Medium to large, cylindrical to irregularly globose, 15 to 25 cm long
• Skin is brown and rough, similar to common tannia
• Flesh is the defining feature: vivid violet-purple to deep magenta throughout
• The purple color is due to high concentrations of anthocyanin pigments
• Starchy and dense, with a slightly nutty flavor when cooked
• Produces side cormels (small tubers) around the main corm
Plant Size:
• Total height 1 to 1.8 meters
• Forms clumps from produced cormels
Flowers:
• Typical aroid spathe and spadix; pale yellow to creamy spathe
• Flowering is uncommon in cultivation
• Per 100 g cooked corm: approximately 115 to 135 kcal
• High in complex carbohydrates (approximately 26 to 30 g per 100 g)
• Moderate dietary fiber (approximately 4 to 5 g per 100 g)
• Rich in anthocyanins — the purple pigments with powerful antioxidant and anti-inflammatory properties
• Good source of potassium (approximately 450 to 500 mg per 100 g)
• Contains phosphorus, magnesium, and iron
• Provides vitamin C, vitamin E, and small amounts of B vitamins
• Low in fat and protein
• The anthocyanin content gives it additional health benefits compared to white-fleshed varieties
• Gluten-free
Toxic Compounds:
• Calcium oxalate raphides present in raw corms and leaves
• Causes intense burning and irritation of mucous membranes if eaten raw
Safe Preparation:
• Peel and boil, bake, or fry for at least 15 to 20 minutes
• Cooking destroys calcium oxalate crystals completely
• Some traditional recipes call for soaking in acidic water before cooking to further reduce acridity
Planting:
• Propagated from cormels or corm tops
• Plant 7 to 10 cm deep, 60 to 90 cm apart
• Plant at the beginning of the rainy season
Growing:
• Requires hot, humid tropical conditions
• Prefers partial shade to full sun with moist, fertile soil
• Takes 8 to 10 months to produce harvestable corms
• Benefits from mulching to retain soil moisture
• Less widely adapted than common tannia; prefers more consistent moisture
Harvest:
• Harvest when leaves begin to yellow, 8 to 10 months after planting
• Dig carefully around the plant to extract corms
• Cormels can be harvested progressively
• Store in cool, dry conditions for 1 to 2 months
Culinary Uses (always cook thoroughly):
• Boiled and mashed — the purple color creates visually stunning purple mashed "potatoes"
• Fried into chips and fries with a distinctive violet hue
• In the Dominican Republic, grated for pasteles and other traditional dishes
• Added to soups and stews where it adds both thickening power and dramatic color
• In Puerto Rico, used in "mondongo" (tripe soup) and "sancocho" (hearty stew)
• Sometimes processed into a naturally purple flour for baking and desserts
Other Uses:
• Ornamental value in tropical landscaping for its purple-stemmed foliage
• The anthocyanin-rich flesh is studied for potential health food applications
• Used in traditional medicine in the Caribbean for digestive complaints
• Increasingly sought after by chefs for its unique color properties
Wusstest du schon?
Purple Tannia produces mashed roots so vividly violet that they look like they've been dyed with food coloring — yet the color is entirely natural, caused by the same anthocyanin pigments that give blueberries their famous blue-purple hue.
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