Raspberry: growth has stalled

What it is likely to be on raspberry

1. Seasonal dieback

   May be normalvery common on this plant

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Raspberries — pruning and cane cycle
   • Cornell Fruit Resources — Cornell University, College of Agriculture and Life Sciences: Brambles — cane biology

   Checked 2026-08-13

   A herbaceous perennial collapsing to nothing in autumn, or a seasonally dormant houseplant dropping most of its leaves in winter. The plant is intact underground and the top growth is expendable — an alocasia that has shed every leaf but has a firm corm is dormant, not dead, and is most often killed afterwards by being watered as though it were still growing.

   Points towards it

   • · it is precisely the older canes that die — the ones that carried this year's or last year's fruit — while the new canes beside them are green and growing
   • · nothing needs to happen; the cane is completing a two-year life
   • · some canes die and others do not, which is the pattern of a life cycle rather than of a stress acting on the whole plant

   Argues against it

   • · this year's new canes dying is not senescence — a first-year cane has not fruited yet and has no reason to die — this rules it out entirely.

   Check this next

   Ask whether the dead canes carried fruit. Summer raspberries, blackberries, tayberries and loganberries fruit on canes in their second year and those canes then die — so brown brittle canes standing among healthy green new ones, in the same row, after a crop, are exactly what a healthy plant looks like in late summer. The distinguishing check against cane blight is which generation is dying: senescence takes the canes that have finished, blight takes canes that should still be alive, including new ones.

   What to do now

   Cut the spent canes out at ground level once fruiting has finished and tie in the new ones to replace them — that is routine maintenance rather than a response to a problem, and the plant needs nothing else. Do not feed or water in response, and do not treat for anything.

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Raspberries — after fruiting

   Checked 2026-08-13

2. Raspberry cane blight

   Candidate 2occasional on this plant

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Raspberry cane blight
   • Agriculture and Horticulture Development Board — AHDB: Cane fruit — cane blight

   Checked 2026-08-13

   Canes that leaf out in spring and then die suddenly, usually while carrying fruit. Dark patches appear near the base and the cane snaps cleanly when bent. It enters through wounds, so most of the prevention is about not making them.

   Points towards it

   • · blight kills canes that should still be alive, including this year's, which senescence never does
   • · a dark purple-brown lesion forms near the base and the bark above it dries, cracks and peels
   • · the fungus enters through base wounds and is worst on wet heavy ground

   Argues against it

   • · canes dying after they have fruited are completing a normal two-year cycle, which is much the commoner explanation

   Check this next

   Take hold of a dying cane near ground level and look at the base. Cane blight leaves a dark brown-purple patch at or just above soil level, and the cane above it snaps cleanly instead of bending because the wood inside has died — a healthy or merely senescing cane bends. Peeling, silvery cracking bark on that lower section confirms it. The decisive question is which canes: blight takes first-year canes that never fruited, and normal senescence never does.

   What to do now

   Cut affected canes right out at ground level, taking them below the lesion, and bin or burn them rather than composting. Avoid wounding the cane bases when hoeing or weeding, since that is the route in, and improve drainage where the row sits wet. No approved fungicide is available to a home grower for it, so removal and avoiding base injury are the whole of the response; a badly affected stool is best replaced with certified stock on fresh ground.

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Raspberry cane blight — control

   Checked 2026-08-13

3. Lime-induced chlorosis

   Candidate 3occasional on this plant

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Raspberries — soil and site
   • Royal Horticultural Society: Lime-induced chlorosis

   Checked 2026-08-13

   Yellowing between the veins of the YOUNGEST leaves while the veins stay green. The soil usually contains plenty of iron; what is wrong is that the pH is too high for the plant to take it up. Adding iron to the soil without correcting the pH changes nothing.

   Points towards it

   • · iron and manganese lock out at high pH, and the leaf yellows between veins that stay green
   • · iron does not move within the plant, so it is the youngest leaves that go short first — the opposite of a magnesium or nitrogen shortage
   • · the soil has been like this all along, so the row never established properly rather than declining after an event

   Argues against it

   • · shortage showing on the oldest leaves first is a mobile nutrient being moved out of them, which iron cannot be — this rules it out entirely.

   Check this next

   Look at where the yellowing starts and ask what the ground is. Lime-induced chlorosis takes the YOUNGEST leaves first — bright yellow between sharply green veins on the new cane tips, while the older leaves lower down stay green — because iron cannot be moved around inside the plant. Nitrogen and magnesium shortages do the reverse and start at the bottom. Then check the soil: chalk in the subsoil, a plot that was limed for brassicas, or builder's rubble near a wall all push the pH beyond what a raspberry can work with, and the canes stay short and thin for years without ever quite dying.

   What to do now

   Do not lime, and do not add a general fertiliser, which usually makes it worse. Mulch generously each spring with composted bark, leafmould or well-rotted manure — acidifying organic matter is the intervention that actually shifts this over a season or two — and use a chelated iron feed for a faster response while it takes effect. Where the ground is genuinely chalky, a raised bed of imported acid loam or a large container is more reliable than trying to correct the plot, and blackberries or a hybrid berry will grow where a raspberry will not.

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Lime-induced chlorosis — treatment

   Checked 2026-08-13

Narrow it down

This page lists everything at once, which is the right shape for reading and the wrong shape for deciding. The interactive tool asks one question at a time, starting with whichever would separate these causes fastest, and stops as soon as further answers would not help.

Opens with the plant and the symptom already set. Nothing you answer is stored or sent anywhere — the answers live in the address bar and nowhere else.

What this does not cover

These are the causes GrowingHQ holds rules for on raspberry — not every cause there is. Where several problems look alike, the honest answer is often that they cannot be told apart by eye, and a page that named one would be guessing. If none of the above fits, the general growth has stalled page lists causes across all plants, and the Raspberry profile lists the problems it is prone to.