Semi-Ripe Cuttings: The Bend Test That Times It

Semi-ripe cuttings are the most useful propagation method available to a British gardener, and the one most often taken at the wrong moment. Get the timing right and a single afternoon in late August fills a cold frame with hebe, choisya, lavender and photinia that would cost £200 at a nursery. Get it wrong by three weeks in either direction and half the tray rots. This guide covers the exact window, the bend test that tells you the wood is ready, and the rooting rates we have logged per species over 12 years on heavy Staffordshire clay.

If you want the wider picture first, our guide to propagation by cuttings, division and layering sets all the methods side by side. This article goes deep on one of them.

What semi-ripe wood actually is

Semi-ripe describes a stage, not a date. It is this season’s growth caught halfway through lignification, the process where a shoot lays down lignin in its cell walls and turns from a soft green whip into wood.

The shoot starts the summer soft throughout. From roughly late June it begins hardening from the base upward, because the oldest tissue is at the bottom. By August the bottom 8-10cm has gone firm and dull, while the top 3-4cm is still bright green and pliable. That split personality is the whole point.

The firm base gives you two things a softwood cutting cannot: enough stored carbohydrate to fuel root growth, and enough structure to stop the cutting collapsing before it roots. The soft tip gives you the other half: an actively growing shoot producing auxin, the natural hormone that drives root initiation, which travels downward to the cut base.

Take the shoot too early and you have all tip and no reserves. It wilts on the bench and rots in the tray. Take it too late and the whole stem has lignified. The auxin supply has shut down for the year, and the cutting sits there for four months forming callus that never becomes a root.

The bend test that proves the wood is ready

This is the part every guide skips and the part that decides your results. Forget the date on the calendar. Pick up the shoot and test it.

Take a shoot of this year’s growth about 15cm long. Hold it at both ends and bend it slowly into a U shape. What happens next tells you exactly which method to use.

Softwood folds with no resistance at all. Let go and it springs straight again. There is no crack and no sound. This shoot is not ready. Leave it three weeks and test again.

Semi-ripe resists. You feel it push back, you hear a faint creak, and then it cracks reluctantly along one side without breaking through. The two halves stay joined. This is your cutting.

Hardwood snaps clean in two with an audible break. The auxin has gone and the shoot is fully lignified. This material is useless for a summer cutting, but it will be perfect in November, taken as a dormant cutting into a slit trench.

Back the bend test up with a thumbnail test. Press your thumbnail into the stem 5cm above the base. On semi-ripe wood the nail dents the skin but does not sink through. On softwood it goes straight in and green sap beads up. On hardwood it barely marks the bark.

Gardener’s tip: Run the bend test on a shoot you do not want, from the back of the plant, before you cut anything you do. One sacrificed shoot at 8am saves you a wasted morning. We test three shoots from three different sides of the same shrub, because a south-facing branch can be ten days ahead of a north-facing one on the same plant.

The bend test in three shoots from one shrub. Left springs back and is still soft. Centre creaks and cracks along one side: this is semi-ripe. Right snapped clean and has gone too far.

When the window opens across the UK

The window runs mid-July to the end of September, but that is a national average and Britain is not one climate.

Our Staffordshire records put usable semi-ripe wood on most evergreen shrubs from about 5 August, peaking between 20 August and 10 September. That fortnight has produced our best rooting in 11 of the last 12 years. In the two cold, wet summers of 2023 and 2024 the wood ripened roughly 12 days late, and our peak fortnight shifted into September.

Regional variation is real and worth planning around. A garden in Cornwall or east Kent typically reaches semi-ripe on hebe and escallonia by late July. A garden in Aberdeenshire or the Pennines may not get there until mid-September, and in a poor year the window closes before the wood is ready.

Aspect matters as much as latitude. A shrub against a south-facing wall ripens 7-14 days ahead of the same cultivar in an open border 10m away. We time our lavender off a bank that catches sun from ten in the morning, and it is always the first thing ready.

Cut in the morning, ideally before 9am, while the shoots are full of water from the night. Cuttings taken at 3pm on a warm August afternoon start the day already stressed. If you must cut later, drop the material straight into a sealed plastic bag with a puff of water and keep it in shade.

Late August, first thing in the morning. Cutting material taken before 9am is turgid and holds itself up on the bench for an hour.

How to prepare a semi-ripe cutting

The preparation is quick once the material is right. Work in shade, and keep the bag closed between cuttings.

1. Select the shoot. Take side shoots rather than leaders, and prefer more horizontal growth with short internodes. A shoot with 2cm between leaves roots better than a vigorous one with 6cm gaps. Avoid anything flowering.
2. Cut to length. Trim to 10-15cm, cutting straight across just below a leaf node. The node is where root initials concentrate. Aim for stem thickness of 3-5mm, roughly a matchstick to a pencil lead.
3. Strip the bottom half. Remove every leaf from the lower 5-7cm. Pull them off cleanly or cut them off. Any leaf buried in compost rots and takes the cutting with it.
4. Keep four leaves at the top. Two pairs is the target. Do not remove the growing tip on most species: it is your auxin factory. The exception is very vigorous material such as Photinia, where pinching the top 1cm stops the cutting trying to grow instead of root.
5. Reduce large leaves. Halve any leaf wider than 6cm across, cutting straight across the blade. This cuts water loss without removing the photosynthesis you need. Fatsia, Hydrangea and Magnolia grandiflora all need this.
6. Wound the hard ones. Slice a 2.5cm sliver of bark off one side of the base with a sharp knife, exposing the green cambium beneath.
7. Insert immediately. Push cuttings into compost so the bottom third is buried, spaced far enough apart that no leaf touches its neighbour.

The wounding step is worth its own note. Across 120 Camellia japonica cuttings split into wounded and unwounded halves in 2022, wounding lifted rooting from 34% to 71%. It works because it exposes a long strip of cambium rather than a single cut face, and it gives rooting hormone somewhere to sit. Do it on Camellia, Ilex, Magnolia, Rhododendron and Ceanothus. Skip it on soft-stemmed herbs, where it just invites rot.

A 2.5cm wound on a camellia cutting. The exposed cambium strip is where roots form, and it lifted our rooting rate from 34% to 71%.

Nodal, heel, mallet and basal cuttings compared

Four preparations exist, and they are not interchangeable. Ranked by how they performed across our trials:

A heel cutting is a side shoot torn downward off the parent stem, bringing a small tongue of older bark with it. Trim the ragged tail back to about 5mm. The heel concentrates natural rooting hormone and seals the base against rot. On Ceanothus it is the difference between a full tray and an empty one.

A mallet cutting takes a 2-3cm section of the parent stem at right angles, with the current shoot rising from the middle, so the base looks like a small mallet. Use it on shrubs with hollow or pithy stems where a normal cut base collapses. Berberis and Mahonia are the classic candidates.

Basal cuttings are shoots pulled from the base of the plant with a scrap of the crown attached. They suit lavender, sage, santolina and hyssop, which is why they overlap with the method in our step-by-step guide to rosemary cuttings.

Three preparations from one shrub. The heel cutting on the left carries a tongue of older bark, which is what lifts Ceanothus rooting above 80%.

Compost, containers and the 18-21C question

Semi-ripe cuttings do not want a rich compost. They want air, sharp drainage, and steady warmth at the base.

Our mix is 50% peat-free multipurpose compost to 50% perlite by volume, and it has beaten every alternative we have tried. Straight multipurpose held too much water and cost us 40% of a tray to rot in 2017. A 70:30 mix rooted well but dried out on hot benches. Horticultural grit works in place of perlite and is cheaper, but it makes a 9cm pot heavy and it does not hold air as well. Garden Organic’s advice on peat-free growing media is a good grounding on why the base compost matters here.

Use 9cm pots with five to seven cuttings round the edge, or a half tray for 24. Round the edge is not superstition: drainage and air exchange are better at the pot wall, and our edge cuttings consistently root 8-12 points ahead of centre ones in the same pot.

Then the temperature. Roots form fastest at 18-21C at the base of the cutting, not in the air. A heated propagator mat delivers that from a September morning when the greenhouse air is 12C. Our paired trials since 2019 average 74% rooted with bottom heat against 51% without, from identical material cut on the same morning.

Just as important, heat moves the timetable. Heated batches average 6 weeks to first root. Unheated batches average 9 weeks, which drags rooting into November. A cutting that roots in November faces winter with nothing established, and that is where losses come from.

Humidity is the third leg. Cover the tray with a lid or a clear bag held off the leaves with canes, aiming for roughly 90% humidity. Vent it for ten minutes a day. A sealed tray with no air movement grows Botrytis, and grey mould moves through a tray of touching leaves in under a week.

Warning: Never let leaves touch each other or the propagator lid. Condensation collects at the contact point, Botrytis starts there, and it spreads outward through the tray. We lost 60 hebe cuttings in nine days in 2018 to one leaf resting against the plastic. Space cuttings so light reaches the compost surface between them, and wipe the inside of the lid dry every morning.

Rooting rates by species from 12 years of counts

This is the table no competitor publishes, because it requires counting rather than repeating. These are our figures, from batches of at least 40 cuttings per species, taken in the last week of August with bottom heat at 20C and rooting gel on woody subjects.

Read the second column as carefully as the first. Camellia at 60-75% sounds good until you notice it takes 14 weeks. A cutting taken on 25 August roots in early December. It needs a frost-free frame and almost no water from November to February, or the 75% that rooted becomes the 30% that survives.

Aftercare from rooting to planting out

Rooting is halfway. More cuttings die in the six months after rooting than during it.

Do not tug. Every gardener does, and every tug shears off the fragile new roots. Wait for one of two honest signals: white root tips at the drainage holes, or new growth at the tip that has clearly extended past where you cut.

Once rooted, harden off over 2-3 weeks. Prop the lid open 2cm for three days, then 5cm for three days, then remove it. Move the pot from propagator to open bench, then to a cold frame.

Do not pot on immediately. This is the single most common mistake we see. A newly rooted cutting has three or four roots 20mm long. Move it into a 1-litre pot of rich compost and it sits in cold wet growing media all winter with no root system to drink it. Leave rooted cuttings in the cutting compost until March, then pot on when they are actively growing.

Overwinter frost-free but cold. A cold frame or unheated greenhouse at 2-7C is ideal. Water perhaps once every three weeks, only when the compost is dry 2cm down. Our winter losses run at 10-15% with that regime and jumped to 35% the year we kept them too warm and too wet.

Plant out in April or May, once the plant has filled a 9cm pot with roots. That is roughly 8 months from cutting to a plant ready for the border.

Cuttings spaced so no leaf touches its neighbour. Touching leaves trap condensation, and Botrytis starts at the contact point.

Why we recommend rooting gel over powder

Why we recommend a gel-based IBA rooting compound: We have compared powder, gel and no hormone every August since 2019, on Camellia, Ceanothus, Photinia and Ilex, in matched batches of 40. Across roughly 960 cuttings the gel averaged 71% rooted, the powder 62%, and untreated 49%. The gap is mechanical, not chemical. Powder falls off a wet stem as it goes into the compost, so most of the dose ends up on the bench. Gel clings to the wound and stays on the cambium. Decant a little into a separate pot and throw the used portion away, because dipping cuttings back into the tub carries fungal spores into next year’s batch. A 50ml tub costs about £6-8 and treats 200 cuttings, which works out under 4p per plant. On hebe, lavender and choisya do not bother: they root at 85-95% without it and the money is wasted.

The root cause of most failed cuttings

When someone tells us their cuttings failed, the compost gets the blame and the compost is almost never at fault. The real cause is water stress in the first four hours, and it happens before the cutting reaches a tray.

A cutting has no roots. It loses water through its leaves from the second it leaves the parent. If it loses more than roughly a fifth of its water content before it is in compost under cover, the leaf cells collapse and cannot recover, and the cutting is dead whether it looks it or not. It will then sit in the tray for six weeks looking passable before it browns off. People conclude they got the compost wrong. They lost the cutting in the first hour.

The reason this is missed is the delay. Nothing visibly goes wrong at the moment of the mistake, so nobody connects a November failure to a walk round the garden in August with cuttings in a trug.

Permanent prevention is a system, not a product. Cut before 9am. Carry a sealed freezer bag, not a trug, and put each cutting in within seconds. Puff a little water into the bag first. Keep the bag in shade and prepare cuttings in shade. Get everything into compost and under cover within two hours, ideally within one. Since we moved to bag-not-trug in 2016, our average rooting across all species rose from 58% to 74% with no other change.

Cuttings overwinter best at 2-7C in a cold frame, watered once every three weeks. Ours share the plot with a supervisor.

Semi-ripe cuttings month by month

Common mistakes with semi-ripe cuttings

1. Trusting the date instead of the wood. “Take semi-ripe cuttings in August” is a national average that fits nobody exactly. A Cornish hebe is ready in July, a Pennine one in September. Bend a shoot into a U and let it tell you.
2. Carrying cuttings in an open trug. Twenty minutes in a sunny trug costs the cutting a fifth of its water and it never recovers. Use a sealed bag with a puff of water inside. This one change moved our overall rooting from 58% to 74%.
3. Removing the growing tip. People pinch out the tip out of habit, copying softwood practice. The tip produces the auxin that drives rooting. Leave it on everything except very vigorous shoots such as Photinia.
4. Potting on too early. A rooted cutting in October has roots 20mm long. Move it into a litre of cold wet compost and it rots by January. Leave it in the cutting compost until March.
5. Letting leaves touch. One leaf resting on the propagator lid is where Botrytis begins, and it moves through the tray in a week. Space cuttings so you can see compost between them.
6. Taking material from a flowering shoot. A shoot carrying buds is spending its reserves on flowers, not roots. Rooting on flowering rosemary shoots fell to 31% in our counts, against 84% from vegetative shoots on the same plant.

What to do when the window closes

Miss the semi-ripe window and you have not missed the year. Deciduous shrubs, currants, willow and dogwood all propagate more easily from dormant wood anyway, and that material is free from November. Softer subjects can be started indoors, which is how our houseplant propagation guide approaches the same problem in a warm room, and some things root perfectly well in a jam jar on a windowsill, as our notes on rooting cuttings in water set out. If you would rather plan the whole year properly, our list of plants to propagate in May is where the spring cycle starts, and strawberry runners need nothing more than a pot and some patience. More practical projects sit in our how-to section.

The honest summary is this. Semi-ripe propagation is not hard, and it is not really about compost or hormone or kit. It is about one judgement made with your hands on a shoot in the last fortnight of August. Learn the bend test and everything downstream gets easier.

The honest signal. White root tips visible at the edge of the rootball, roughly six weeks after cutting. Never tug a cutting to check.

Now you can read the wood, take our hardwood cuttings guide and use the same shrubs again in November, when the material that snapped clean in your bend test is exactly what you want.

Frequently asked questions

When should I take semi-ripe cuttings in the UK?

Mid-July to the end of September, with late August the strongest fortnight. The exact date matters less than the wood. In a cold northern summer the shoots ripen two or three weeks later than in Kent, so run the bend test rather than trusting a calendar. Our best batches over 12 years came from cuttings taken between 20 August and 10 September.

What is the difference between softwood and semi-ripe cuttings?

Softwood is this year’s growth still soft throughout; semi-ripe has gone firm at the base. Softwood is taken from May to early July and wilts within minutes of cutting. Semi-ripe holds itself up on the bench for an hour. The base has begun to lignify and turned from bright green to a duller green or light brown, while the top 3-4cm stays soft and green.

How do I know if a cutting is semi-ripe?

Bend the shoot into a U shape. Ripe wood cracks reluctantly instead of springing back. Softwood folds without resistance and springs straight again. Fully hardened wood snaps clean in two. Semi-ripe sits between them: it resists, creaks, then splits along one side. A thumbnail pressed into the base should dent the skin without sinking in.

Do semi-ripe cuttings need rooting hormone?

Not for easy species, but it helps significantly on woody ones. Hebe, lavender and rosemary root at 85-95% without it. Camellia, Ceanothus and Photinia are a different matter: our paired trials put rooting gel containing IBA at 71% against 49% untreated. Gel outperformed powder by 8-11 points, mostly because powder falls off a wet stem before it reaches the compost.

How long do semi-ripe cuttings take to root?

Six to ten weeks at 18-21C, longer on an unheated bench. Hebe and Escallonia often show roots at the drainage holes inside 5 weeks. Camellia and holly can take 12-14 weeks and may not finish until spring. Do not tug a cutting to check. Wait for new growth at the tip or white root tips at the base of the pot.

What is a heel cutting and when should I use one?

A heel cutting is a side shoot pulled off with a sliver of older wood attached. Use it for plants that resist normal nodal cuttings: Ceanothus, Pyracantha, Berberis and most conifers. The heel carries a concentration of natural rooting hormone and blocks the entry point for rot. Trim any ragged tail back to about 5mm with a sharp knife before inserting.

Can I take semi-ripe cuttings in October?

You can, but rooting rates fall sharply and losses over winter rise. Our October batches averaged 38% rooting against 74% in late August. Light levels and bench temperatures both drop, so the cutting callouses without rooting and then sits wet for months. If you have missed the window, wait for the dormant season and take hardwood cuttings instead.