How to Take Nasturtium Cuttings and Root Them Reliably

Yes, Nasturtiums Root From Stem Cuttings

Nasturtiums (Tropaeolum majus, and the trailing species Tropaeolum peregrinum) are usually raised from seed, but cuttings work too, and they solve a specific problem: seed-grown nasturtiums vary. If you have a plant with a flower color you love, a compact habit that suits a pot, or especially dark foliage, a cutting gives you a genetically identical copy. The same technique also lets you carry a favorite plant through a cold spell on a windowsill indoors rather than starting over from seed in spring.

The catch is that nasturtiums are soft, sappy, hollow-stemmed plants. They root from the growing shoot rather than from old woody wood, and they rot easily if kept too wet. Understanding those two facts explains nearly every practical choice below.

How Cutting Propagation Actually Works

A stem cutting is a piece of shoot with at least one node — the point where a leaf and its bud meet the stem. At that node sits dormant tissue that can produce roots. When you sever the stem below a node and give the cut end a moist, airy medium, the plant redirects its stored energy and hormones toward making new roots, while the leaves above continue making sugars through photosynthesis.

The balance matters more than any secret trick. Too few leaves and the cutting has little energy to build roots; too many leaves and it loses water faster than a rootless stem can replace it. Nasturtiums are quick-growing and generous rooters when the cutting is young and healthy, so the aim is simply to keep a small, vigorous tip alive long enough for roots to form.

Choosing the Shoot to Cut

Take material from healthy, actively growing plants. A good cutting is a young shoot tip, roughly 8–12 cm (3–5 inches) long, with two or three sets of leaves and a firm, fresh stem. Soft new tips work best; old flowering stems with hardened bases root poorly and rot more readily.

• Timing: Take cuttings in active growth — spring to midsummer in most temperate gardens. Avoid cutting in heat stress, and move outdoor plants to a shadier spot a week beforehand if you can.
• Condition: Water the parent plant the day before, not the same hour, so shoots are turgid but not dripping.
• Flowers and buds: Remove any flowers or buds from the cutting. They draw energy away from rooting.
• Hygiene: Use clean, sharp scissors or a knife. A clean cut seals less slowly than a crushed one.

If you want to know the flower color of your cutting, remember it will match the parent plant exactly. This is the main reason to propagate nasturtiums by stem rather than seed: seed traits vary, cuttings do not.

Preparing and Planting the Cutting

Trim the cut to just below a node and strip off the lower leaf or leaves so a clean stem section sits below the surface. Leave the upper leaves attached. Nasturtium leaves are large and lose water quickly, so a shade cover and steady humidity matter.

Use a light, free-draining mix — a seed-and-cutting compost with added perlite or coarse sand, or a 50/50 blend of peat-free multipurpose compost and perlite. Fill small pots or a tray with cells, firm gently, and insert the cutting so one or two nodes sit in the medium. A little rooting hormone for softwood cuttings can help, though nasturtiums generally root without it.

• Moisture: Water once to settle the medium, then keep it barely damp. Soggy medium is the main cause of failure.
• Humidity: A plastic bag or clear propagator lid raises humidity and reduces wilting, but open it briefly each day for airflow.
• Light: Bright, indirect light. Direct strong sun will dry and scorch a rootless cutting.
• Temperature: Warm room temperature, roughly 18–22°C, speeds rooting. Avoid cold windowsills.

A heated propagator base gives a steadier, warmer root zone, which is worthwhile if you are rooting cuttings in a cool room or propagating several plants at once. A simple unheated propagator lid is usually enough in a warm spot.

What to Expect While Roots Form

Expect some wilting in the first few days. If the cutting stays limp under a lid, that is normal; if it collapses and turns black at the stem, the medium is too wet or the cutting was too old. Roots typically appear within roughly two to four weeks in warm conditions, and new leaves signal success. Gently tugging is a destructive test, so wait until fresh growth appears before checking the base.

Once roots are visible and the plant is growing, harden it off if it is going outdoors: move it to a shaded, sheltered spot for a few days, then gradually into more sun. Plant it out at the same depth it grew in its pot, water in, and keep an eye on slugs, which find young nasturtiums appealing.

Growing Cutting-Grown Nasturtiums On

Nasturtiums flower best where they are not overfed. Cuttings grown in rich compost can produce masses of leaf and few flowers, so a leaner mix and modest feeding once rooted favor bloom. They perform well in pots and hanging baskets where trailing types can cascade, and the long-spurred flowers of the canary creeper (Tropaeolum peregrinum) make a lighter, airier display than the broad-leaved garden nasturtiums.

Indoors, give cuttings a bright position with several hours of direct light once rooted; a sunny balcony or conservatory suits them better than a shaded room. Water when the surface of the medium begins to dry, and check pots regularly in summer, since the plants are thirstier once they are growing strongly.

For a striking pot display, combine cutting-grown nasturtiums with a simple, fine-textured support — a small obelisk or a few twiggy stems — so trailing shoots have something to climb. Choose containers with drainage holes and a saucer to manage the inevitable summer watering.

Keeping Your Own Colour Line

Propagating nasturtiums from cuttings is one of the simpler skills in ornamental gardening, and it lets you multiply a plant you already admire rather than gamble on seed. Take a healthy young tip, keep it moist but airy, give it warmth and light, and be patient for a few weeks. The reward is a pot of identical plants — same flowers, same leaves, same vigor — ready for a patio, a hanging basket or a gift to a friend.