Ornamental · Apocynaceae
Common Periwinkle
Vinca minor
An evergreen groundcover that washes shaded ground in soft blue, quietly finishing the corners a garden forgets.
Partial shade
Every 7–14 days
USDA 4–9
3–6 in · 8–15 cm
Overview
Common periwinkle is the low, trailing evergreen that turns the awkward ground beneath trees into a calm sheet of green threaded with spring blue. A member of the dogbane family, it settles in as a hardy perennial, keeps its leaves through the coldest months, and travels on its own rooting stems. In a garden it reads as a finishing layer, the quiet green that ties beds, paths, and tree bases together.
Designers reach for it where a planting scheme runs out of ideas. It brings order to dry shade, softens a raw slope, and carpets the poor soil along a fence line or foundation, and once it settles it asks for almost nothing through a dry summer. That easy, even coverage is why it has anchored shade gardens for generations.
The look comes with a caveat worth planning around. Left unchecked, periwinkle drifts past its edges and into woodlands, crowding out native wildflowers and young trees, so it belongs in a defined bed with clear boundaries and well away from wild ground. Every part is also toxic, a detail to weigh before it lines a path where pets or children pass each day.
Care
The short version: set it in part to full shade and average well-drained soil, water deeply only through dry spells, and shear it each spring to keep the carpet tidy and contained.
Light
Periwinkle looks its best in part to full shade, which is why it works so gracefully beneath trees where a lawn thins and fails. It will take full sun in cooler regions, but where summers turn hot, strong sun scorches the leaves unless the soil stays moist, so a shaded setting keeps the carpet even.
Water
Keep the soil moist but well drained while a new planting settles, watering every 7 to 14 days through dry spells and a little more where it sits in full sun. Once established it carries a dry season with ease. Water at the base rather than overhead, since damp foliage invites the fungal disease that spoils the look.
Soil
Average, well-drained soil suits it, and it takes clay, loam, sand, and dry rocky ground in stride, which makes it forgiving in difficult corners. It settles most handsomely into moist, humusy soil at a pH of 6.0 to 7.5, comfortably near neutral.
Temperature
This is a cold-hardy groundcover, holding through temperatures from -29°F to 95°F (-34°C to 35°C). Its evergreen leaves carry the winter garden when little else does, and it only loses composure where summer heat meets dry, sunny ground.
Humidity
Ordinary outdoor humidity is all it asks, so there is no target to manage. Airflow matters more than moisture in the air, since crowded, damp plantings are where stem canker and leaf spot take the shine off an otherwise tidy carpet.
Feeding
Periwinkle rarely needs feeding and keeps its looks on poor soil without fuss. If the growth ever thins, a light spring feeding of balanced all-purpose fertilizer restores it.
Pruning
Shear or mow an established planting in early spring to refresh the carpet and hold its edges. The same pass clears away winter-worn or diseased foliage before the new season fills back in, keeping the whole sweep even.
Repotting
Grown in the ground it never needs repotting, and even in a container it rarely does. Watch for roots circling the pot, growth slowing, or roots slipping from the drainage holes as the signs it has grown rootbound and wants a larger home.
Size & spacing
Each plant stays low at 3 to 6 inches (8 to 15 cm) tall while spreading 6 to 18 inches (15 to 46 cm) wide and reaching on. Set plants at that spacing and they close into a smooth, continuous carpet within a season or two.
When to plant
Periwinkle is hardy across zones 4 through 9, and spring or early fall is the moment to place it, while cool, moist soil helps it knit in before the season turns. Its blue flowers arrive from spring into early summer, around May to June, then reappear here and there through the warmer months, a soft, recurring note rather than a single show.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Spring or early fall
- Harvest: Spring into early summer (May to June), with sporadic rebloom through summer and fall
Hardiness
USDA hardiness zones: 4–9
Temperature: down to -34°C
Troubleshooting
Nearly every issue with periwinkle traces to one of two extremes: it grows too freely, or it sits too wet. The early signs below help you tell a wandering planting from an ailing one. Read what the bed is telling you, then step in while it still makes a difference.
A carpet that wanders past its intended edges
This is invasive spread, the very vigor that makes periwinkle such a dependable carpet. Its trailing stems root wherever they meet soil, so a composed patch drifts into lawns, beds, and nearby woods and overtakes what was there. Dig and pull the escaping runners, edge the bed with a clean barrier, and bin every rooted piece rather than composting it, since a single missed fragment sets the whole spread in motion again.
Fix:
- Pull, dig, or cut back escaping stems and remove rooted fragments
- Mow or shear to contain edges and install an edging barrier
- Dispose of clippings and pulled plants in the trash, not in yard waste or woods, to prevent spread
- Repeat removal over several seasons since regrowth is common
Brown, failing patches with sunken cankers at the base
This is fungal stem canker and dieback, the most common trouble periwinkle meets, and it settles in where a planting sits crowded, wet, and slow to drain. Look for sunken, wound-like marks on the stems near the soil and brown circular spots on the leaves within a fading patch. Thin the affected growth to open the airflow, water at the base rather than overhead, and rake away the infected debris so nothing lingers to reinfect next season.
Fix:
- Thin and remove affected stems and leaves to improve air circulation
- Avoid overhead irrigation and water at the base
- Rake out and discard infected debris
- Reduce overcrowding when replanting
Scorched, yellowing leaves in hot, dry sun
This is heat and drought stress, and it appears only where a planting bakes in full sun with no moisture to draw on, while shaded, well-watered stretches stay green. Water deeply through dry spells and lay down mulch to hold the moisture in. Where summers run hot, give periwinkle the part to full shade it prefers and the carpet stays composed.
Fix:
- Water deeply during dry periods
- Mulch to conserve soil moisture
- Site in partial to full shade where summers are hot
Toxicity
For all its easy charm, periwinkle is toxic in every part. It carries vinca alkaloids, the same family of compounds behind certain chemotherapy drugs, and chewing or swallowing it brings drooling, vomiting, and diarrhea, with low blood pressure, tremors, and even seizures after a large dose. Keep the plant and its trimmings away from cats, dogs, horses, livestock, birds, and children, and call your vet or poison control if any is eaten.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Moderate
A nibble of the leaves or stems is enough to bring on drooling, vomiting, and diarrhea. Should a cat eat much, the alkaloids can lower blood pressure, set off tremors, and in quantity lead to seizures.
Dogs Moderate
Chewing the foliage tends to bring drooling, vomiting, and diarrhea before long. The real concern is a large mouthful, which can lower blood pressure and trigger tremors or even seizures.
Horses Moderate
Grazing on periwinkle upsets the gut with drooling, vomiting, and diarrhea, and a horse's size offers no cover. Larger amounts bring low blood pressure, tremors, and seizures.
Rabbits Toxic
The vinca alkaloids leave no part of the plant safe to feed. Expect drooling and a badly upset stomach, with tremors and collapse if a rabbit eats much, so keep it out of reach.
Livestock Toxic
Cattle, goats, and sheep all react to the alkaloids in the leaves and stems with drooling, vomiting, and diarrhea. Heavier grazing brings falling blood pressure, tremors, and seizures.
Birds Toxic
No part of periwinkle is safe for a bird to peck or eat. Even small amounts cause drooling and stomach upset, and more can lead to tremors and seizures.
People Caution
Nothing on this plant is meant for the table, so treat it as a hazard for curious children. Swallowing leaves or stems can cause drooling, vomiting, and diarrhea, and a large amount may lower blood pressure or bring tremors.
Keep plants and trimmings away from pets and children; wash hands after handling and dispose of clippings where animals cannot reach them.
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
Periwinkle offers more than the familiar blue, with white and burgundy blooms and gold-touched foliage to suit a range of planting palettes. These are the selections worth specifying by name.
Bowles (Bowles' Variety / 'La Grave')
A vigorous selection with larger, deep lilac-blue flowers, and among the most sought-after periwinkle cultivars for a polished shade planting.
'Atropurpurea' (sold as 'Burgundy')
A moodier choice that trades the usual blue for deep reddish-purple to burgundy flowers.
'Alba'
A white-flowered form of common periwinkle for a cooler, quieter palette with the same trailing habit.
'Illumination'
Prized for its bright gold-and-green variegated leaves, lifted by blue flowers, for beds that want a touch of light.
'Jekyll's White'
A compact, white-flowered selection that keeps a neater outline than the more spreading types.
Vinca major (Bigleaf/Greater Periwinkle)
A larger, bolder relative that mounds to about 2 feet with bigger 1 to 2 inch blue flowers, and it turns more invasive in mild climates.
Vinca major 'Variegata'
A variegated bigleaf periwinkle edged in creamy white, a favorite for spilling gracefully over containers and hanging baskets.
How to propagate
Periwinkle all but multiplies itself, and a gardener can guide that habit along through cuttings, division, or the simple layering the stems already manage on their own.
Stem cuttingsEasy
Late spring to summer · A few weeks to root; full groundcover in 1-2 seasons
Take tip cuttings from non-flowering stems in late spring or summer and they root with little effort. Allow them a few weeks to establish, and they fill in to a complete carpet within one to two seasons.
DivisionEasy
Throughout the growing season · Establishes quickly; complete cover in 1-2 years
Lift a rooted clump or a rooted trailing stem at any point in the growing season and replant it wherever the scheme wants more. It settles in quickly and closes into full cover within a year or two.
LayeringEasy
Growing season · Roots where stems touch soil within weeks
Periwinkle layers itself through the growing season without any prompting. Wherever a trailing stem rests on moist soil it roots at the node within weeks, and the new plant can be severed and moved once it has taken.
Myths
Trailing groundcover periwinkle is the same plant as the annual bedding vinca.
The two share a name but not an identity. The trailing evergreen perennial groundcover is Vinca minor, while the upright annual sold for flowerbeds is Madagascar periwinkle, Catharanthus roseus, once called Vinca rosea. Both belong to the dogbane family and both are toxic, though the annual carries even stronger vinca alkaloids such as vincristine and vinblastine.