Why is my rose dying back from the tips?

Distinguishing simple stub dieback from canker and from a plant failing at the roots, and the cutting-back-to-clean-wood method that stops it spreading.

Difficulty: beginner
Time: 30 min
Read: 4 min
Safety: caution

Short answer

Cut the affected stem back in stages until the cut face is pure white all the way through, with no brown staining in the centre, then cut a little further and check again. Brown or discoloured pith means you are still in infected wood. If the dieback runs all the way to the base and the wood there is discoloured too, the problem is at the roots and pruning will not fix it.

Stems dying back from the tip are common and usually not serious: the plant is sealing off wood it cannot support, often after a bad cut, a hard frost or a dry summer. What matters is telling that ordinary dieback apart from canker, which spreads down a stem and into the framework, and from root problems, where the dieback is a symptom of something you cannot cut out.

Safety

You will be cutting into diseased wood, so clean the secateur blades with hot soapy water or a garden disinfectant between every plant and after finishing — pruning tools transfer canker and other infections extremely efficiently. Wear gauntlet gloves; rose scratches from dead brittle wood are dirty wounds and infect readily.

Step by step

Look at where the dieback starts.Dieback from a cut end, working downward, usually follows a bad prune — cut too far above a bud, cut in frost, or cut with blunt secateurs that crushed the stem. This is the mildest case.
Look for a sunken, cracked, discoloured patch on the stem.That is canker. It appears brown or purplish, often with a cracked or shrunken area of bark and sometimes small dark pinhead fruiting bodies. Everything above it dies because the canker girdles the stem's plumbing.
Cut back in stages and read the pith.Take off 50mm at a time and look at the cut face. Healthy rose wood is clean white right through. Brown or grey staining in the central pith means the infection extends further down, so keep going until you find white.
Cut to just above an outward-facing bud, at a slight angle.A cut left as a long stub above the bud dies back and starts the process again. About 5mm above the bud, sloping away from it.
Bin the prunings.Do not compost cankered wood or leave it lying under the plant. Bin it or burn it.
Disinfect the blades before moving to another plant.Rose canker is transferred on tools. Hot soapy water or a garden disinfectant between plants, and always after cutting anything visibly infected.
If the dieback reaches the base, check the graft union and the roots.Scrape the bark at the base with a thumbnail. Green underneath means it is alive. Brown, dry and peeling means the plant is dying from below, and the cause is at the roots — waterlogging, drought, root damage, or in some cases honey fungus.
Address what weakened it.Canker enters through wounds and takes hold on plants under stress. Feed in spring with a rose fertiliser, mulch, water deeply through dry spells, and prune cleanly with sharp secateurs. A vigorous rose resists it; a starved dry one does not.
Decide honestly whether the plant is worth keeping.A rose with canker in the main framework near the base, or one that dies back further every year despite good treatment, is not going to come right. Removing it and planting a healthy resistant variety is usually the better use of the space.

Tips

Some tip dieback every winter on a hybrid tea is normal and is dealt with automatically by the annual late-winter prune.
Blunt secateurs crush the stem rather than cutting it, and crushed tissue dies back and admits infection. Sharpening secateurs is a genuine disease-prevention measure.
Dieback that appears suddenly on several stems at once in summer, with wilting leaves still attached, is more likely to be a root problem or waterlogging than canker.

Common mistakes

Cutting back to the first point that looks alive from the outside — The infection travels in the pith ahead of any external sign. Judge by the colour of the cut face, not the appearance of the bark.
Sealing the cut with wound paint — It traps moisture and pathogens against the wound. Roses seal their own cuts, and modern practice is to leave them open.
Moving from an infected plant to a healthy one without cleaning the blades — It is one of the most reliable ways to spread canker around a rose bed.

If it doesn't work

Brown dead stub above a pruning cut

Cause: Cut too far above the bud, or in frost — Fix: Cut back to just above a healthy bud with sharp clean secateurs. No further action needed.

Sunken cracked brown patch, everything above it dead

Cause: Canker — Fix: Cut well below it into clean white wood, bin the prunings, disinfect the tools, and feed and mulch the plant.

Several stems dying back at once, whole plant looking poor

Cause: Root problem — waterlogging, drought or damage — Fix: Check drainage and watering. Improve the soil and mulch. Pruning treats the symptom only.

Whole plant dead above the graft union, healthy shoots below it

Cause: The variety has died and the rootstock has taken over — Fix: The shoots below the union are the wild rootstock and will never be the rose you bought. Remove the plant.

Questions people ask

How far back do I cut?

Until the cut face is clean white right through the centre, then a little further to be sure. If that means cutting to the base, cut to the base.

Can rose canker be cured?

There is no treatment for the infection itself. The management is to cut it out completely, remove the infected wood from the garden, keep the plant vigorous so it resists further attack, and prune cleanly so you are not creating new entry wounds.

Is dieback contagious to other roses?

Canker can be spread on tools and by spores, so tool hygiene and removing infected wood matter. Simple tip dieback from a bad cut or frost is not.