Shrub · Vitaceae
Boston Ivy
Parthenocissus tricuspidata
Plant it for a wall of crimson in fall, but give it masonry to climb, not your siding.
Full sun
Every 7–14 days
USDA 4–8
30–49 ft · 9–15 m
Overview
Boston ivy is the vine behind those famous sheets of green that flush deep crimson-red to purple every autumn. It belongs to the grape family rather than the true ivies, and it traces back to eastern Asia. Tough and fast growing, it shrugs off cold down to USDA zone 4 and heat that pushes near 100°F (38°C).
What sets it apart is how it climbs. Instead of twining, it grips with adhesive disk-tipped holdfasts that cement themselves to almost any surface, so a single plant can sheet a whole wall on its own. That same grip is the catch: it bonds to paint, shingles, and mortar and is hard to take down cleanly, so steer it onto masonry, stone, a fence, or a trellis rather than wood siding.
Once it roots in, this is a low-effort plant. It handles full sun or deep shade, drinks little after it settles, and asks for almost no feeding. The main job is keeping its vigorous growth in bounds with a hard prune each year so it stays off your windows, gutters, and roof.
Care
The short version: plant it in average, well-drained soil in sun or shade, water it through the first season and rarely after, and prune it hard each late winter to keep its fast growth off your walls and roof.
Light
Boston ivy grows in just about any light, from full sun to full shade. Sun brings the richest fall color, while in deeper shade the vine still fills in but the autumn display is more muted.
Water
Water young plants while they settle, letting the top half of the soil dry between drinks. Once established the vine is very drought tolerant and adapts to most conditions, so a soak every 7 to 14 days is plenty in a dry spell.
Soil
Almost any well-drained soil works, including clay, sandy, and rocky ground. It takes a wide pH range from 5.5 to 7.5, which is part of why it grows in so many places.
Temperature
This is a genuinely hardy vine, taking cold to -29°F (-34°C) and heat up to 100°F (38°C). That range covers USDA zones 4 through 8 with no special protection.
Humidity
Outdoor humidity suits it fine, so there's nothing to measure. Air movement matters more than moisture in the air, since still, crowded growth invites leaf spot and mildew.
Feeding
Feeding is rarely needed because the vine is already so vigorous. If growth lags, a single balanced general-purpose feed in spring is all it wants.
Pruning
Plan on a hard prune in late winter or early spring to keep the fast growth in check. Cut it back off windows, gutters, roofs, and wood siding before the new season pushes out.
Repotting
Most plants go straight in the ground rather than a pot. For a container-grown vine, repot every 2 to 3 years, or sooner if roots circle the pot, growth stalls, or water runs straight through.
Size & spacing
Given something to climb, it reaches 30 to 50 feet (9 to 15 m) tall and spreads 5 to 10 feet (1.5 to 3 m) wide. Plan for that reach and the support it will cover before you plant.
When to plant
Boston ivy is woody and perennial, so there's no seed-starting rush. Set young plants out in spring or fall while the soil is workable, let the vine fill in over the seasons, and look for its quiet June-to-July flowers followed by the crimson-to-purple show in autumn.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Spring or fall
- Harvest: June to July (flowers inconspicuous); brilliant crimson-red to purple fall foliage
Hardiness
USDA hardiness zones: 4–8
Temperature: down to -34°C
Troubleshooting
Most trouble with Boston ivy is either the wall it's gripping or the leaves it's growing. Read the early signs and you can redirect or treat before the damage spreads. Match what you see below, then act while it still helps.
Sticky disks gripping the wall and lifting paint or shingles
The vine climbs with adhesive disk-tipped holdfasts that bond so hard they tear off paint and pull up residue when you remove them. Heavy growth also traps damp against the wall and pries into seams, working under shingles and into mortar. Keep it on masonry, a rock wall, a fence, or a sturdy trellis, and cut the stems at the base first so the disks dry and weaken before you scrape them off.
Fix:
- Do not grow on wood, shingle, or painted surfaces; redirect onto masonry, rock walls, fences, or sturdy trellises
- Cut vines at the base and allow holdfasts to dry and weaken before gentle removal
- Scrape or sand off remaining residue and refinish damaged surfaces
Spotted, powdery, or chewed-up leaves
Fungal leaf spot and powdery mildew settle in when air sits still around crowded, humid growth, leaving dark blotches and a white film on the leaves. Japanese beetles, scale, and leafhoppers add to the damage, skeletonizing foliage as they feed. Open the planting up for better airflow, water at the base rather than overhead, pick beetles off by hand, and treat stubborn scale with horticultural oil.
Fix:
- Improve air circulation and avoid overhead watering to reduce fungal disease
- Hand-pick Japanese beetles and treat scale or heavy infestations with horticultural oil or an appropriate insecticide
- Remove and dispose of heavily diseased foliage
Toxicity
This is not a plant to nibble. Both the leaves and the blue-black berries hold insoluble calcium oxalate crystals and oxalic acid, sharp compounds that sting the mouth and irritate the gut. Keep pets, livestock, and children from chewing the foliage or eating the berries, which carry the higher risk.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Mild
The sharp oxalate crystals sting the mouth the moment a cat bites a leaf or berry, so watch for drooling, pawing at the face, and an upset stomach with vomiting or loose stool.
Dogs Mild
A dog that chews the foliage or berries usually drools and goes off its food, and the mouth irritation often comes with vomiting or diarrhea soon after.
Horses Mild
The same crystals irritate a horse's mouth and gut, bringing on drooling, mouth discomfort, and a dull, off-feed look if it grazes the vine.
Rabbits Mild
Best kept out of reach, since the oxalates burn the mouth and can leave a rabbit drooling, reluctant to eat, and dealing with a sore digestive tract.
Livestock Mild
Cattle, goats, and sheep rarely seek it out, but a mouthful of leaves or berries irritates the mouth and gut and can leave an animal salivating and off its feed.
Birds Caution
The blue-black berries are the riskiest part, so treat the plant as one to keep caged birds away from rather than a safe browse.
People Caution
No part of this plant is food. Eating leaves or berries irritates the mouth and stomach, so keep curious children away from the foliage and fruit.
Keep pets and children from chewing the foliage or eating the berries, which are the higher-risk part.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
A few named selections trade the plain green for different leaf shapes and colors. These are the ones you're most likely to find.
Veitchii
Carries smaller leaves that emerge purple to bronze in spring and turn red in fall.
Fenway Park
Stands out with golden chartreuse to lime-yellow foliage that breaks into a multicolored autumn display.
Lowii
Shows small, curly, deeply lobed leaves that turn crimson once fall arrives.
How to propagate
Boston ivy is easy to multiply, and you have three routes depending on how much patience you have and what time of year it is.
Stem cuttingsEasy
Softwood cuttings in early summer or hardwood cuttings in late fall to winter · 4 to 8 weeks to root
Cuttings are the quickest route to new plants. Take softwood cuttings in early summer or hardwood cuttings from late fall into winter, and they root in 4 to 8 weeks. Where a stem already touches the ground, you can pin it down and let it root in place instead.
LayeringEasy
Spring through summer · Several weeks to a few months
Layering is about as simple as propagation gets with this vine. Pin a low stem against the soil any time from spring through summer, and it roots on its own over several weeks to a few months before you sever it from the parent.
SeedModerate
Sow after cold stratification in late winter or spring · Several weeks to germinate
Seed takes more patience. Clean the seeds from the berries, give them a cold spell to break dormancy, then sow in late winter or spring and expect germination over several weeks. Cold stratification is the step that makes the difference.
Myths
Boston ivy is a true ivy.
Despite the name, it isn't an ivy at all. Boston ivy belongs to the grape family, Vitaceae, which makes it a far closer cousin to grapes than to the true ivies in the genus Hedera.