Vinca is one of the easiest plants to multiply, because its trailing stems grow roots almost anywhere a leaf joint stays moist. You can snip stems and root them in water or potting mix, or coax a stem to root while it’s still attached to the parent. The second approach succeeds so reliably because the parent keeps the stem supplied with water and food the whole time.1Trees.com. Propagating with Layering A plant that roots this eagerly can also spread further than you intended, so where you plant it matters as much as how.
Rooting Vinca Cuttings in a Glass of Water
Start by looking over the vine for a healthy, green trailing stem rather than an old woody or yellowing one. Choose a stem with no flowers on it, because a flowering stem puts its energy into blooms rather than roots.2Ask Extension. Vinca won’t grow roots – Ask Extension Make the cut just below a leaf joint, where leaves attach to the stem, since that is where new roots start.3Ask Extension. Vinca won’t grow roots – Ask Extension Use clean, sharp scissors or pruners so the stem is cut rather than crushed.
A piece 10 to 15 cm (4 to 6 in) long with a few leaf joints is easy to handle. Take several cuttings at once, since a few may fail and spares cost nothing.
Remove all the lower leaves so none sit in the water.4Ask Extension. Vinca won’t grow roots – Ask Extension Then stand the stem in a clean container of water with at least one bare leaf joint submerged.5Ask Extension. Vinca won’t grow roots – Ask Extension Leave the top pair or two of leaves in place, because they let the cutting make food while it grows roots.
A narrow jar holds stems upright so the leaves stay out of the water, and clear glass lets you check the roots without disturbing the cutting. Bright, indirect light, such as near a window but out of hot direct sun, suits it. Sunny sills warm the water and grow algae.
New roots often start to show within one to a few weeks.6Ask Extension. Vinca won’t grow roots – Ask Extension Small white bumps appear at the submerged leaf joint first, then lengthen into roots. The leaves above water may droop slightly the first day, then perk up. Change the water every few days to keep it fresh. If the water turns cloudy or the stem base goes slimy and brown, that is rot: trim the stem and restart in fresh water. Roots 2 to 3 cm long are enough to move the cutting to soil.
Rooting Cuttings Straight in Potting Mix
Vinca roots even from a short piece with just one leaf joint, which is how nurseries multiply large numbers of plants.7Journal of Environmental Horticulture. Propagation of Vinca minor by Single-node Cuttings Push the bare leaf joint into the mix so it is covered, with the top leaves above the surface. Dipping the cut end in rooting hormone, a product sold at garden centres, is optional for a plant this willing.
A light seed or cutting mix, or potting mix with added perlite or coarse sand, drains well. Dense garden soil stays wet and airless, so cuttings rot in it. Water the mix before inserting the cuttings so it is evenly damp throughout. Small pots or a tray let you root several pieces together.
Poke a hole with a pencil or finger first, then lower the stem into it, so the bark on the buried joint isn’t scraped off by the mix. Firm the mix gently around the stem so it stands upright and the joint touches damp mix on all sides. Space the cuttings so the leaves don’t overlap heavily, since packed damp foliage invites mould.
A rootless cutting can’t draw up water, so its leaves dry out unless the air around them stays humid. Commercial growers keep leaves damp with mist and re-wet them before they dry completely.8GrowerTalks. Managing Propagation Mist At home, a clear plastic bag or bottle over the pot does the same job by trapping moisture. The mix itself should be damp, not soggy, or the buried stem rots. Soil-rooted cuttings skip the transition water roots need and usually settle in faster outdoors.
New leaves growing at the tip are the clearest sign that a soil cutting has rooted. A gentle tug meets resistance once roots grip the mix, and roots may show at the pot’s drainage holes. Once growth starts, open the bag gradually over a few days.
Layering a Vine While It’s Still Attached
Layering means letting a stem grow roots while it stays attached to the parent plant, then cutting it free.9Grow Organic. Ground Layering for Plant Propagation The parent keeps supplying water and food, so the stem avoids the drying and starvation that kill some cuttings.10Trees.com. Propagating with Layering Vinca often does it by itself, rooting wherever its stems lie on damp ground.
Choose a long, flexible stem and bend it down to the soil without snapping it. Loosen the soil at the pinning spot with a trowel or fork and mix in a little compost or potting mix, so new roots can push in easily. Make a shallow dip to lay the stem in, so water collects around the joint rather than running away, and clear away any weeds or heavy mulch that would keep the joint from touching soil.
Strip the leaves from one leaf joint and press that joint into the loosened soil, or into a pot of mix sunk beside the parent. Hold it down with a bent wire or U-shaped pin, the way gardeners peg woody shrubs.11Royal Horticultural Society. Layering Plants Vinca roots readily on its own, so it usually needs no cut in the stem.
Keep the pinned spot moist, like the soil around a newly planted seedling. After a few weeks, tug gently; resistance means roots have formed, and new shoots near the pinned joint also signal success. Cut the stem between the parent and the new plant, then leave it in place for a week or two to settle. Pinning into a pot sunk beside the parent lets the plant lift out with no root disturbance, and several stems can be layered into separate pots at once.
The fastest method of all needs no waiting. Look along the edge of the patch for stems already rooted into the ground, cut the connecting stem, and lift the rooted piece with a trowel, soil attached. Replant at once and water well.
Planting Out Your New Vinca
Vinca does best in partial shade, though it can survive in full sun.12Washington State Noxious Weed Control Board. Periwinkle, large and small Under trees, beside shady walls, or on a north-facing bank are ideal spots. In containers, any decent, free-draining potting mix will do.13HortScience. PHYSICAL PROPERTIES OF MEDIA COMPOSED OF GROUND WHOLE PINE TREES AND THEIR EFFECTS ON VINCA (CATHARANTHUS ROSEUS) GROWTH14HortScience. PHYSICAL PROPERTIES OF MEDIA COMPOSED OF GROUND WHOLE PINE TREES AND THEIR EFFECTS ON VINCA (CATHARANTHUS ROSEUS) GROWTH Spring and early autumn are the easiest times to plant out, when soil is moist and heat is mild.
Prepare the spot first. Dig over the ground and remove perennial weeds, since they are hard to pull out once the vinca has knitted together. Mix a little compost into poor or heavy soil so new roots find loose, crumbly ground. Dig each hole as deep as the root ball and a bit wider, so the plant sits at the level it grew at before.
Pot water-rooted cuttings first into small pots of damp mix and keep them sheltered for a week or two, keeping the mix consistently moist. Expect a short pause in growth before new leaves appear.
For groundcover, plant several rooted pieces in a loose grid so they knit together. Closer spacing fills ground faster but uses more plants. Mulch between them to keep weeds down while they spread; gaps typically close over one to two growing seasons.
In the first season, water during dry spells until the plants are clearly growing. Avoid heavy feeding, which pushes soft growth over roots. Pinch long stems to encourage bushier, denser cover. Hanging-basket vinca needs more frequent watering than ground plantings.
Why Some Cuttings Fail
Flowering stems and leaves left underwater are the usual reasons water cuttings fail.15Ask Extension. Vinca won’t grow roots – Ask Extension Leaves that dry out completely before roots form cause cuttings to wilt and die.16GrowerTalks. Managing Propagation Mist Take cuttings from a healthy, well-fed parent plant.17Journal of the American Society for Horticultural Science. Physiological Response of Rhododendron Cuttings to Different Light Levels During Rooting18Forest Ecology and Management. The rooting ability of Triplochiton scleroxylon cuttings: the interactions between stockplant irradiance, light quality and nutrients
A black, mushy stem base means rot: trim above it and restart in fresh water or drier mix. A dirty jar can carry rot from a previous plant, so wash it with hot soapy water before using it for cuttings. Crisp, brown leaves mean the cutting dried out, so add humidity with a cover. Yellowing lower leaves are normal as the cutting uses their stored food. Healthy leaves but no roots after three weeks often mean no leaf joint is buried or submerged.
Roots grow from the leaf joint, so a stem with no joint under water or under mix will sit there green but never root. If the bottom of a cutting is a bare stretch between joints, trim the stem so a joint sits at the base and restart. Check that a joint is really below the waterline or the surface, not just near it.
A green, firm stem is still alive even without visible roots, so give it more time. A soft or shrivelled stem will not recover. Because vinca is so easy, starting fresh is often quicker than nursing a weak cutting, and switching to layering sidesteps most of these problems.
Keeping Vinca From Taking Over
Periwinkle can easily escape garden plantings.19Washington State Noxious Weed Control Board. Periwinkle, large and small The same habit that makes it easy to propagate, rooting at leaf joints, lets it creep steadily outward. In some regions it is listed as a weed of concern, so check local guidance before planting near woodland.
To contain it, plant inside edging, between paths and walls, or in containers. Trim runners at the bed’s edge each spring and autumn, and lift stray rooted pieces as soon as you see them. Never dump trimmings in wild areas, since every stem piece can root.
Lesser periwinkle (Vinca minor) has small leaves and stays low as groundcover. Greater periwinkle (Vinca major) has larger leaves and longer, more vigorous runners. The variegated trailing vine sold for pots is usually a form of greater periwinkle. Both propagate by the same cutting and layering methods.
Annual vinca, or Madagascar periwinkle, is an upright bedding plant, not a trailing vine. It is usually grown from seed or bought as young plants each year. The methods here are for the trailing perennial periwinkles.