How to Grow Frost Line
Wikimedia Commons
Frost Line
Ipomoea batatas 'Frost Line'
vegetableFrost Line is an ornamental sweet potato variety prized for its stunning variegated foliage with white, pink, and green markings on heart-shaped leaves. While it produces edible tubers, it is primarily grown as a decorative houseplant or container specimen for its striking foliage rather than harvest. This tender perennial is an excellent choice for adding visual interest to indoor spaces and container gardens.
When should you plant Frost Line 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 Frost Line timeline · Pittsburgh, PA (Zone 6b)
-
Plant Frost Line
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Frost Line
Around Jul 16≈ 90 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Frost Line dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Best in zones 9-12; grow as a houseplant or annual in cooler zones
Sign up free to see if Frost Line grows in your zone — and get a personalized planting timeline.
Get my Frost Line timeline →Growth Stages
Slip Development
1-2 weeksYoung rooted slips begin to establish roots and produce first true leaves
Keep in warm conditions (70-80°F), maintain consistent moisture, provide bright indirect light. Avoid direct sun which can stress tender new growth.
Vegetative Growth
4-8 weeksRapid vine growth with new leaves emerging regularly; foliage variegation becomes more pronounced with proper light
Provide bright indirect light for best color development. Water consistently, feed with balanced fertilizer every 2-3 weeks. Pinch back growing tips to encourage bushier growth and fuller foliage display.
Established Growth
OngoingPlant reaches desired size with mature variegated foliage fully developed; vines can trail or climb depending on support
Maintain bright light conditions, regular feeding schedule, and consistent moisture. Provide stakes or trellises if vertical growth is desired. Remove any solid green leaves to maintain variegation.
Flowering (Optional)
VariableSmall purple or pink flowers may appear, though this is rare on containerized plants grown indoors
If flowers appear, they typically do not lead to significant fruit set in indoor conditions. Continue regular care routine.
Dormancy/Winter Rest
2-3 monthsGrowth slows significantly in winter months; foliage may appear less vibrant
Reduce watering frequency, maintain temperatures above 60°F, provide consistent light. Avoid cold drafts and sudden temperature changes. Resume regular feeding in spring.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Increase humidity, spray with water, apply neem oil or insecticidal soap; improve air circulation
-
Remove with alcohol-soaked cotton swab, apply insecticidal soap or neem oil, isolate infested plant
-
Manually remove, treat with horticultural oil or neem oil, monitor regularly
-
Yellow sticky traps, spray with neem oil or insecticidal soap, improve air circulation
-
Ensure well-draining soil, avoid overwatering, repot if necessary with fresh soil, improve drainage
Uses
Indoor Decorative Houseplant
HouseholdFrost Line's striking variegated foliage makes it an excellent choice for brightening indoor spaces, adding tropical elegance to living rooms, offices, and conservatories. The unique white, pink, and green color patterns create visual interest and serve as a living art installation. [source]
Container and Hanging Basket Display
HouseholdIdeal for container gardening both indoors and in warmer outdoor climates, with cascading vines perfect for hanging baskets or elevated planters. The trailing growth habit creates beautiful visual displays on patios, porches, or window sills. [source]
Edible Tubers and Leaves
CulinaryWhile grown primarily for ornament, Frost Line produces edible sweet potato tubers that can be harvested and cooked. The young leaves can also be consumed as nutritious greens in salads or cooked dishes, similar to spinach. [source]
Ornamental Foliage for Arrangements
CraftThe striking variegated leaves make excellent additions to fresh flower arrangements and botanical displays, providing interesting texture and color contrast. Stems can be cut and conditioned for use in floral design. [source]
Pollinator-Friendly Plant
WildlifeWhen flowering occurs, the flowers attract bees, butterflies, and other pollinators, making it a wildlife-friendly choice for gardens. Even as a houseplant, it supports indoor ecosystems and is non-toxic to common household pets. [source]
Harvest Tips
Frost Line is grown primarily for foliage display rather than tuber harvest. If tubers are desired, wait until 100-150 days after planting and carefully dig around the plant to harvest without damaging the root system. Remove leaves as needed to maintain plant shape and encourage fuller growth, but avoid removing excessive foliage which the plant needs for energy.
Fun Facts
- 🌱 Frost Line's variegation is caused by the presence of a virus-like particle, similar to the mechanism that creates the famous variegated patterns in ornamental sweet potato varieties. This makes each plant's pattern slightly unique.
- 🌱 Despite being called a 'Frost Line,' this variety is actually frost-tender and cannot survive freezing temperatures, thriving only in warm climates above 60°F; it was likely named for the delicate white markings that resemble frost on the leaves.
- 🌱 Sweet potatoes are not actually potatoes at all but belong to the morning glory family (Convolvulaceae), making Frost Line distantly related to common ornamental morning glories despite their very different appearance.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Frost Line planting timeline
Tell us your zip code and we'll calculate exactly when to start Frost Line seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Frost Line timeline →