How to Grow Taiwan Purple
Wikimedia Commons
Taiwan Purple
Ipomoea batatas 'Taiwan Purple'
vegetableTaiwan Purple is a ornamental sweet potato variety prized for its stunning deep purple foliage and vining growth habit. While it produces small tubers, it's primarily grown as an ornamental houseplant or landscape accent rather than for substantial food production. The plant creates dramatic visual interest with its heart-shaped purple leaves and trailing stems.
When should you plant Taiwan Purple in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Taiwan Purple timeline · Pittsburgh, PA (Zone 6b)
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Plant Taiwan Purple
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Taiwan Purple
Around Aug 15≈ 120 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Taiwan Purple dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 10-11; can be grown in zones 9b with protection or as an annual
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Get my Taiwan Purple timeline →Growth Stages
Slip Rooting
2-3 weeksNewly rooted slips develop initial root systems and produce 1-2 true leaves
Keep in humid conditions with indirect light. Maintain warm temperatures (70-80°F). Avoid direct sun initially.
Vegetative Growth
4-8 weeksPlant develops multiple heart-shaped purple leaves and trailing vines; stems become more robust
Provide bright light to enhance purple coloration. Fertilize every 2-3 weeks with balanced fertilizer. Pinch tips to encourage bushier growth if desired.
Trailing & Establishment
6-12 weeksLong vining stems develop, creating cascading or spreading growth. Plant becomes well-established
Provide support structures if desired. Reduce fertilizer frequency. Monitor for spider mites in dry indoor conditions.
Maturation
OngoingExtensive vine development with consistent purple foliage. Vines may reach 3-6 feet or more
Manage growth by pruning back if needed. Continue regular watering. In late fall/winter, reduce water to encourage dormancy.
Dormancy
3-4 months (winter)Plant slows growth significantly; foliage may yellow or drop in cool conditions (below 60°F)
Drastically reduce watering. Move away from cold drafts. Can be overwintered indoors in dormancy state.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Increase humidity, spray with water, use neem oil if severe
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Isolate plant, use yellow sticky traps, spray with insecticidal soap
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Remove with alcohol-soaked cotton swab, spray with neem oil
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Rarely issues indoors; destroy infested tubers, use preventative pesticide if growing for food production outdoors
Uses
Indoor Ornamental Plant
HouseholdTaiwan Purple's dramatic purple foliage makes it an excellent houseplant for bright windowsills, hanging baskets, or trailing over shelves. It thrives in warm indoor environments and adds tropical ambiance year-round. [source]
Landscape & Garden Accent
HouseholdIn warm climates, use as ground cover, cascading plant in containers, or hanging basket specimen. The purple coloration provides striking color contrast in garden beds. [source]
Edible Tubers (Limited)
CulinaryWhile primarily ornamental, Taiwan Purple produces small edible tubers that can be cooked like regular sweet potatoes, though yields are minimal compared to food-crop varieties. [source]
Propagation & Houseplant Cultivation
CraftTaiwan Purple is easily propagated from stem cuttings, making it popular among plant collectors and houseplant enthusiasts for sharing and multiplying plants. [source]
Pollinator-Friendly Foliage
WildlifeWhile flowers are rarely produced indoors, outdoor plants may attract pollinators. The dense foliage provides shelter for beneficial insects. [source]
Harvest Tips
Taiwan Purple is grown primarily for ornamental foliage rather than food. Small tubers can develop but are rarely harvested; if attempting harvest, dig carefully in fall/winter after vines have died back. Remove cuttings anytime for propagation by placing stems in water or moist soil.
Fun Facts
- 🌱 Taiwan Purple is sometimes called 'Purple Heart' or 'Purple Ornamental Sweet Potato' and is distinct from the unrelated plant Tradescantia pallida (also called Purple Heart)
- 🌱 The purple pigmentation comes from anthocyanins, the same antioxidant compounds found in blueberries and red grapes, which intensifies under bright light conditions
- 🌱 Taiwan Purple can be grown entirely in water using hydroponic methods, making it a trendy choice for water-based houseplant displays
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