How to Grow Blackie Sweet Potato Vine
Blackie Sweet Potato Vine
Ipomoea batatas 'Blackie'
vineBlackie is an ornamental sweet potato vine cultivar prized for its dramatic deep purple to nearly black heart-shaped foliage. It grows as a vigorous trailing or climbing vine that serves as an excellent accent plant in containers, hanging baskets, and garden beds. The dark foliage provides striking contrast to lighter plants and flowers.
When should you plant Blackie Sweet Potato Vine in your zone?
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Example Blackie Sweet Potato Vine timeline · Pittsburgh, PA (Zone 6b)
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Plant Blackie Sweet Potato Vine
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 Blackie Sweet Potato Vine
Around May 17≈ 30 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Blackie Sweet Potato Vine dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Grows best as an annual in zones 3-7; perennial in zones 8-11
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Slip/Transplant Establishment
2-3 weeksYoung plants with 2-4 leaves establishing root systems and initial growth
Keep soil consistently moist, provide bright light, protect from wind stress, maintain warm temperatures (70-80°F ideal)
Vegetative Growth
4-8 weeksRapid vine elongation with new heart-shaped leaves unfolding; deep purple coloration intensifies in strong light
Provide support or allow trailing; pinch growing tips to encourage bushiness if desired; feed every 2 weeks with balanced fertilizer
Full Growth/Maturity
Throughout growing seasonVine reaches full length (3-8 feet depending on conditions), dense foliage coverage, rich black-purple leaf color fully developed
Maintain consistent moisture and nutrition; remove any diseased or damaged foliage; manage growth with pruning if needed
Flowering
4-12 weeks, sporadic bloomingSmall lavender, pink, or white morning glory-type flowers appear in late summer; flowers open in early morning
Flowering is incidental to ornamental value; no special care needed
Season End/Frost Sensitivity
Variable depending on locationPlant dies back with first frost; foliage blackens and collapses in freezing temperatures
In frost-prone zones, harvest tubers before frost or treat as annual; in warm zones, may regrow from tubers next spring
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with insecticidal soap or neem oil; increase air circulation; inspect undersides of leaves regularly
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Mist foliage to increase humidity; spray with neem oil or miticide; remove heavily infested leaves
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Inspect slips before planting; destroy infested plants; practice crop rotation; no chemical treatment recommended
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Spray with water jet; use insecticidal soap or neem oil; attract natural predators
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Remove with alcohol-soaked cotton swab; spray with insecticidal soap; isolate infected plants
Uses
Edible Tubers
CulinaryThe underground tubers can be harvested and cooked like regular sweet potatoes, though ornamental varieties may be less developed than agricultural types. They offer the same nutritional benefits and can be baked, roasted, or used in soups and stews. [source]
Container & Garden Accent
HouseholdThe striking black-purple foliage serves as a dramatic visual accent in mixed container plantings and landscape beds, providing year-round color in warm climates. It combines beautifully with bright flowers and light-colored foliage plants for striking contrast. [source]
Trailing & Climbing Versatility
HouseholdCan be trained as a trailing specimen in hanging baskets, allowed to cascade from planters, or supported on trellises for vertical interest. Its vigorous growth habit makes it excellent for quick coverage and seasonal garden design. [source]
Pollinator Support
WildlifeThough grown primarily for foliage, the morning glory-type flowers attract pollinators including bees and butterflies during bloom season. Provides nectar source in mid to late summer. [source]
Traditional Root Medicine
MedicinalSweet potato tubers have been used in traditional medicine systems for their anti-inflammatory and antioxidant properties. Modern research supports their high content of beta-carotene and vitamin C. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Blackie is grown primarily for foliage rather than harvest, but in zones where tubers form, dig tubers after first frost when vines die back. Handle tubers carefully to avoid bruising. Store in cool (55-60°F), dark location. For continuous foliage display in containers, simply pinch back stems as needed throughout the season and enjoy the dramatic purple leaves.
Fun Facts
- 🌱 The 'Blackie' cultivar was bred specifically for ornamental foliage and does not reliably produce substantial edible tubers like agricultural sweet potato varieties, making it a purely decorative choice.
- 🌱 Sweet potato vines can grow 3-8 feet in a single season when given warm temperatures and adequate nutrition, making them among the fastest-growing ornamental vines for rapid garden coverage.
- 🌱 The deep purple foliage color comes from high anthocyanin content, the same pigment that makes blueberries purple and provides significant antioxidant benefits to the edible tubers.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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