How to Grow Sweet Potato Vine 'Blackie'

Sweet Potato Vine 'Blackie'

Ipomoea batatas 'Blackie'

vine

A dramatic ornamental sweet potato vine cultivar prized for its deep purple-black, heart-shaped foliage that creates striking visual contrast in gardens and containers. Unlike edible sweet potato varieties, 'Blackie' is grown primarily for its decorative foliage rather than tuber production, though it produces the same delicate purple-pink flowers. This vigorous trailing vine is a tender perennial typically grown as an annual in most climates.

Growing Conditions

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Sun: Full sun, 6-8 hours daily; tolerates partial shade but color is more vibrant in full sun

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Water: Moderate watering; keep soil consistently moist but not waterlogged. Water deeply when top inch of soil is dry. Reduce watering in cooler months. Container plants may need daily watering in heat.

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Spacing: 12-18 inches between plants for vining; allow 18-24 inches in containers for full spread inches

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Days to maturity: 10-14 days for visible foliage color; reaches full mature size in 4-6 weeks

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Planting depth: Plant rooted cuttings or slips at soil level; tubers 1-1.5 inches deep

Soil

Type: Well-draining loamy soil rich in organic matter

pH: 6.0-6.8

Amendments:

Compost peat moss or coconut coir perlite for container growing

Growing Zones

Find your zone →

Thrives in zones 9-11; grown as an annual in zones 3-8

9a 9b 10a 10b 11a 11b

Growth Stages

Establishment

1-2 weeks

Small rooted cuttings with 2-4 true leaves; plant appears delicate and developing

Keep soil consistently moist without waterlogging. Protect from strong wind. Begin light fertilizing after 2 weeks. Place in warm location (65-75°F minimum).

Vegetative Growth

4-8 weeks

Rapid vine extension with dark purple-black foliage becoming larger and more deeply colored; vines extend 12-36 inches monthly

Provide sturdy support structure or trailing space. Fertilize every 2 weeks with balanced fertilizer or diluted liquid fertilizer. Maintain consistent moisture and warmth. Pinch tips occasionally to encourage bushier growth if desired.

Mature Foliage

Continues until frost (8-16 weeks)

Full vine coverage with deeply colored black-purple heart-shaped leaves creating dense cascading foliage; plant reaches desired size

Maintain regular fertilizing and watering schedule. Prune back occasionally to shape or prevent excessive spreading. Monitor for pests on undersides of leaves. Continue deadheading flowers if growth is priority.

Flowering

6-10 weeks total (intermittent)

Small delicate purple-pink or lavender trumpet-shaped flowers appear among the foliage; blooming is secondary to foliage display

Flowers are minor but attractive; deadhead if you want to maximize foliage energy. Blooming typically begins midsummer and continues until frost. No special care needed during flowering.

Decline/Frost Sensitivity

Occurs at first frost (typically October-November in northern zones)

First frost damages foliage severely; vines blacken and wilt rapidly when temperatures drop below 50°F

In zones 3-8, grow as annual and discard or compost after first frost. In zones 9-11, may die back and regrow from roots. Dig tubers before hard freeze if you want to save for next year's propagation.

Companion Planting

Plan your garden →

Plant with:

Calibrachoa Petunias Bacopa Dichondra Iresine Coleus Trailing Scaevola

Avoid planting near:

Other aggressive vining plants that compete for space Plants requiring consistently dry conditions

Common Pests

Spray with neem oil or insecticidal soap; increase humidity around plant; rinse foliage regularly with water
Use yellow sticky traps; spray with neem oil or insecticidal soap; encourage beneficial insects
Spray with strong water jet; use insecticidal soap or neem oil; encourage ladybugs and parasitic wasps
Remove infested tubers; practice crop rotation; use pheromone traps; inspect transplants before planting
Isolate infested plants; spray with neem oil or horticultural oil; remove with rubbing alcohol on cotton swab

Uses

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Container and Hanging Basket Cascades

Craft

The dark purple foliage makes an excellent trailing accent in containers, hanging baskets, and window boxes, providing dramatic contrast to bright flowers or silvery-foliaged plants. Its vigorous trailing growth (24-36+ inches per season) makes it ideal for creating lush, full baskets quickly. [source]

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Garden Design and Landscaping

Household

Used as a ground cover, cascade over walls, or draping from elevated planters to add textural and color contrast in mixed borders and landscape designs. The dark coloring complements bright annuals and provides a sophisticated backdrop. [source]

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Edible Leaves (Limited)

Culinary

While primarily ornamental, the leaves of sweet potato vines are technically edible and nutritious, similar to spinach, though 'Blackie' is selected for ornament rather than taste. In some cultures, tender young leaves are eaten in salads or cooked dishes. [source]

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Pollinator Attraction

Wildlife

The delicate purple-pink flowers attract bees, hummingbirds, and other pollinators to the garden, supporting beneficial insect populations throughout the growing season. [source]

Harvest Tips

Sweet Potato Vine 'Blackie' is grown for foliage, not edible harvest. Prune vines as desired for shape and size control. Pinch off stem tips to encourage bushier growth. In zones 9-11, dig tubers in fall before hard frost if you wish to store them for propagating new plants next season. If propagating, store tubers at 50-60°F and moderate humidity.

Fun Facts

🌱 Sweet Potato Vine 'Blackie' gets its dark coloring from high anthocyanin content (a powerful antioxidant pigment), the same compound that makes blueberries and purple cabbage nutritious.
🌱 'Blackie' is a relatively modern cultivar developed in the late 1990s specifically for ornamental gardening and is now one of the most popular foliage plants for mixed containers.
🌱 A single 'Blackie' plant can produce multiple long trailing vines that collectively cover 50+ square feet in a single season, making it extremely vigorous and cost-effective for large-scale landscaping.

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