English Ivy
Hedera helix · Common Ivy
It scrambles up trees, rocks and walls in European woodland, clinging with tiny aerial rootlets. The same vine sold as a cute trailing houseplant is now banned for sale outdoors in parts of the US because it climbs and kills forest trees.
Family
Araliaceae
Origin
Europe and western Asia
In the wild
Climbs 20–30 m
Indoors
Kept small, trained
Growth
Fast
With pets
Toxic
Where it's from
Europe and western Asia
Woodland and walls
Native across Europe into Scandinavia and Russia, scrambling up trees, rocks and old walls in damp shade.
Outdoors: zones 4–9
Genuinely cold-hardy, unlike the tropical plants it shares a shelf with.
Banned outdoors
Illegal to sell in Oregon and Washington because escaped ivy smothers ground flora and kills native trees.
Houseplant, weed, and medicine
Standardised dried ivy-leaf extract is a licensed cough medicine, with a published European Union herbal monograph for the leaf. The same plant is a banned invasive weed outdoors and a cute trailer on the shelf. But the extract is a processed pharmaceutical, not a reason to chew the raw leaf, which is toxic.
A real expectorant
Leaf saponins loosen mucus; ivy-leaf syrups are sold over the counter for productive cough.
Two kinds of leaf
Juvenile stems carry the familiar lobed leaves; only mature growth high in the light makes plain leaves and flowers.
It clings by itself
Aerial rootlets grip walls and bark, and can root into soil, so one plant spreads as a self-rooting carpet.
How to keep it
LightBright, indirect
Variegated forms need more light to keep their markings; in shade they revert to plain green.
WaterLet the top dry
Water thoroughly, then let the top centimetre dry before watering again. Soggy soil rots the roots.
HumidityModerateAdapts to normal home air, but dry indoor heat invites spider mites.
Temperature10–21°CLikes cool-to-moderate rooms, a little cooler at night. Very cold-hardy outdoors.
SoilWell-draining mixA quality houseplant mix that drains freely.
FeedingMonthly in growthA light foliage feed during active growth. Pause in summer heat and in winter.
DifficultyEasy to moderateEasy to keep, but watch for mites and legginess in dim, dry rooms.
With petsToxicTriterpenoid saponins. Vomiting, drooling and stomach pain if chewed. The foliage is more toxic than the berries.
PropagationStem cuttingsTip cuttings root readily in water or moist soil; it also layers where stems touch the ground.
RepottingWhen root-boundStep up only an inch in pot size, or the soil stays too wet.
What the data says
The clean-air star that wasn't
English Ivy was a headline winner of NASA's 1989 study, removing nearly 90% of benzene in a sealed box.
89.8%
of benzene removed over 24 hours, but inside a small sealed chamber, nothing like a ventilated room. Drexel's 2019 reanalysis found you would need hundreds to thousands of plants to rival opening a window. Keep it for the looks.
What it costs
A mass-produced commodity. The variation is which cultivar you pick, not scarcity.
$10–30
Named award cultivars and unusual leaf shapes carry a small premium. There is no four-figure collector market here.
IUCN · Not assessed
In the wild
The opposite of a vanishing plant. It is abundant, and in the wrong places it takes over.
Escaped ivy smothers ground plants and climbs and eventually kills native trees, especially in the Pacific Northwest. Oregon prohibits its sale, and Washington added a sale ban effective 2025. It is also listed invasive in Australia, New Zealand and Canada. Keep it potted, and never plant it out.
When it sulks
Stippled, webbed leavesSpider mites, the signature indoor pest, thriving in warm dry air. Rinse the foliage and treat early.
Leggy, bare stemsToo little light. Pinch and prune to force bushier growth.
Fading variegationNot enough light. Variegated forms revert toward plain green in shade.
Brown, crispy edgesDry air or underwatering.
Yellowing, mushy stemsOverwatering and poor drainage leading to root rot.
Varieties & company
The varieties
GlacierGold ChildGoldheartNeedlepointHahn's Self-Branching
Pairs with · keep apart from
FernsPeace LilyPothosSnake PlantZZ PlantCacti
A new plant, every week.
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