Water Propagation: Grow Ivy, Coleus and Busy Lizzie from Cuttings

Many amateur gardeners know the problem: at the start of summer, beds can still look rather sparse, while a visit to the garden centre has already made a noticeable dent in the wallet. Yet just three popular ornamental plants can be used to produce new specimens in no time, needing only water, a glass and a little patience.

Why early summer is the perfect time

Cuttings can generally be propagated successfully between April and September. June and early summer are particularly favourable, however. At this point, plants are growing vigorously, their shoots are young and pliable, and temperatures usually sit between 20 and 25°C.

“During this growth phase, healthy shoots in water often develop strong roots in as little as one to four weeks.”

For amateur gardeners, this means that cuttings placed in water now can usually be planted in soil later in the same month. A small number of parent plants can therefore quickly provide entire rows of new additions for beds, containers and window boxes, without another shopping trip.

The three stars of water propagation

Not every plant is happy in a glass of water. These three species, however, form roots especially reliably:

• Ivy – a hardy climber for fences, walls and hanging baskets
• Coleus – a colourful foliage plant for pots and window boxes
• Busy Lizzie (Impatiens) – a long-flowering choice for partially shaded and shaded spots

All three root quickly, forgive minor mistakes and give even beginners an early sense of success. That makes them ideal plants for trying this method.

Basic equipment: what you actually need

Water propagation does not require professional equipment. Most of what is needed is already available at home:

• clean, sharp secateurs or a knife
• clear glasses or transparent cups
• tap water left to stand for a few hours
• a bright location without direct midday sun, such as a windowsill

Rooting hormones or specialist additives can sometimes speed up the process, but they are usually unnecessary for these three species. Cleanliness matters more: washing tools and containers beforehand greatly reduces the risk of rot.

The basic method: how water propagation works

Whichever species you choose, the process follows the same core steps:

• select a healthy, non-woody shoot
• cut the shoot to the appropriate length, between 7 and 15 centimetres
• make the cut just below a node, where leaves join the stem
• remove leaves from the lower section so that none can rot in the water
• place one or two nodes in water, keeping the leaves above the surface
• change the water regularly and keep the glass clean
• plant into soil once the roots are around 2.5 to 5 centimetres long

“The node below the water surface is the crucial area: this is where new roots develop.”

Making an angled cut slightly increases the cut surface and can help roots get started. It is still important not to crush or smear the cut end with your fingers.

Ivy in a glass of water: a climber in miniature

Ivy is among the hardiest candidates for water propagation. Once prepared correctly, a single parent plant can provide numerous new trailing stems.

How to succeed with ivy cuttings

• choose a strong stem measuring roughly 10 to 15 centimetres
• ensure it has several nodes
• cut just beneath a node
• remove the lower leaves completely
• submerge two nodes, leaving the rest above the water

Placed somewhere bright but out of direct sun, ivy will usually produce clearly visible clusters of roots within two to four weeks. Once they are about five centimetres long, the young ivy can be moved into a pot of loose growing medium. This keeps its growth manageable, so it does not immediately take over the entire bed.

Coleus: an explosion of colour from a glass of water

Coleus is prized above all for its colourful foliage. Starting several cuttings at once makes it possible to grow entire colour combinations for free.

What matters when propagating coleus

Unbranched, soft shoots measuring 8 to 12 centimetres are ideal. Remove flower stems thoroughly, as they use up the plant’s energy and slow root development. Leave only two or three leaves at the top and take off everything below them.

“Less leaf mass means less evaporation – allowing the cutting to direct its energy into roots.”

If the glass is kept in a bright position and the lower leaves are removed consistently, fine roots often appear after only one to two weeks. When the white mass of roots reaches roughly the length of a matchstick, it is worth potting the cutting into a low-nutrient, loose compost mix. The coleus will then quickly become bushier and can later be divided or used for further cuttings if required.

Busy Lizzie: a cloud of flowers from a few shoots

Busy Lizzie is a classic choice for shaded window boxes. Buying plants can become expensive, especially when larger numbers are needed. Water propagation makes it easy to fill whole boxes.

Turning a few shoots into complete rows

• choose shoots between 7 and 10 centimetres long
• do not leave any buds or flowers on the cuttings
• strip off the lower leaves cleanly
• only the bare section of stem should sit in the water

Replace the water every two to three days, as Busy Lizzie is sensitive to rot. After one to two weeks, root lengths of 2.5 to 3 centimetres are enough to plant the young specimens into a window box or bed. In partial shade to full shade, they quickly create a continuous display of flowers.

Common mistakes that are easy to avoid

Beginners in particular may wonder why cuttings in a glass turn yellow or become soft. The most frequent causes can be avoided with a few simple measures:

• too many leaves in the water: this causes rot, so remove foliage generously
• forgetting to change the water: refresh it at least every five days
• direct sun: this heats the glass and stresses the cuttings
• waiting too long before potting on: very long water roots break easily when planted

Avoid positioning the glasses too closely together and check every cutting individually, so problems can be spotted early. Cloudy water or a musty smell are clear warning signs.

From a glass of water to soil: making the transition work

The delicate stage comes when young plants are moved into growing medium. A few basic rules make establishment easier:

• use loose, fairly fine soil that is not overly rich in nutrients
• ensure the pot or window box drains well to prevent waterlogging
• spread the roots carefully rather than pressing them in firmly
• gently firm the growing medium and water thoroughly
• keep plants in a shadier spot for the first few days and maintain even moisture

“The best time for planting is a mild, overcast day – when the young shoots lose less water through evaporation.”

With this gentle treatment, the roots will grow from their previous water environment into their new surroundings. After around two weeks, vigorous new growth shows that the transition has worked.

Why water propagation pays off in the long term

After using this technique a few times, its value soon becomes clear. It not only protects the budget but also provides greater flexibility when designing the garden. Rather than searching the garden centre for suitable colour combinations, you can simply multiply your own favourite plants.

It also improves resilience against losses: even if individual specimens fail to survive the winter or are weakened by a hot day, replacement plants may already be waiting in a glass of water or a pot. Many gardeners deliberately create a “cutting reserve” in summer, ready to use in autumn or the following spring.

Anyone keen to experiment can later try the technique with other plants, such as scented geraniums, certain herbs or houseplants including pothos and philodendron. The three classics described here remain ideal practice partners: forgiving, fast-growing and responsive to every attempt.