Green, apparently healthy cherries stop growing and fall from the tree before they ripen, some years just a scattering, other years most of the crop. RHS and Pacific Northwest Extension both describe the same process — and genuinely disagree on how much it's worth trying to manage.
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What it looks like
Fruit that appears to be developing normally stops growing and falls, sometimes turning shades of brown to grey just before it drops, sometimes showing a partial blush of ripening colour despite being immature. Pacific Northwest Extension describes three distinct waves: the first about two to two-and-a-half weeks after full bloom, a second about a week after that, and a smaller third wave roughly three weeks after the second. Fruit already on the ground is typically smaller than normal, slightly dehydrated, discoloured but not rotting, and still has a green stem attached.
The cause: weather, pollination, and a tree sorting its own crop
A combination of climatic factors is linked to heavier drop: poor weather and low light intensity at blossom time, low temperatures in the early stages of fruit development, and reduced energy reserves following a wet, cold autumn the year before. Poor pollination, lack of water while fruit is developing, and other adverse weather during flowering all contribute too. The exact mechanism isn't fully pinned down: the range of possible explanations includes lack of pollination, lack of fertilisation, self-incompatibility, nutrient imbalance, winter injury, frost around bloom time, and high temperatures during bloom, and some cultivarsA plant variety that arose or was bred under cultivation and is kept true by deliberate propagation, rather than a naturally occurring wild species. Full definition →, 'Sweetheart' among them, shed more fruit than others regardless of conditions.
RHS calls this cherry fruit drop; Pacific Northwest Extension uses the alternative name 'Cherry Run Off' for the same process, and the two sources take a genuinely different stance on what to do about it. RHS treats it as a problem worth actively reducing, with pruning, thinning and site selection as the response. Pacific Northwest Extension calls the underlying process normal abscission and states no cultural control is needed. Both can be true at once: a normal process that, per RHS's own records, took as much as 90% of the UK's sweet cherry crop in a genuinely bad year (2000).
Why this matters in Scotland
Several of the named triggers describe exactly the kind of spring a Scottish garden is more likely to get than the UK average: poor weather and low light at blossom time, low temperatures during early fruit development, and frost around bloom. That points towards more drop here, not less, on years when the weather runs true to form.
What actually works, if you want to reduce it
The steps below follow RHS's mitigation stance. Pacific Northwest Extension records the same phenomenon but doesn't offer a control step of its own, since its position is that none is needed.
Prune for an open canopy that lets in more light
Poor light at blossom time is one of the climatic factors linked to heavier drop, so a more open canopy that lets more light reach the blossom and developing fruit works against that specific trigger.
Thin fruit while fruitlets are still under 5mm across
Reducing the number of fruitlets a tree is trying to support works against the crop-load side of the problem, giving the fruit that remains a better share of the tree's resources.
Use a warm, sheltered, sunny spot — a light-coloured wall or path nearby can help too
Giving the tree the warmest, best-lit position available works against the low-temperature and low-light triggers named above. A sunny wall or a light-reflecting surface nearby adds a small amount of extra warmth and light on top of the site's own conditions.
Frequently asked questions
Is my cherry tree diseased if fruit keeps falling off?
Almost certainly not. Pacific Northwest Extension describes this as a normal abscission process that most cherry trees go through to some degree, not a disease or pest problem. RHS records a genuinely severe example, 90% of the crop lost in the UK in 2000, so a bad year can feel dramatic, but the underlying process is normal rather than a sign the tree is unhealthy.
When does the fruit actually drop?
Pacific Northwest Extension describes three waves: the first about two to two-and-a-half weeks after full bloom, a second about a week after that, and a smaller third wave roughly three weeks after the second. Fruit that has dropped is typically smaller than normal, slightly dehydrated, discoloured but not rotting, with a green stem still attached.
Is there a spray or feed that stops it?
No. Neither source names any chemical product for this. It's a physiological response to weather, pollination and the tree's own crop-thinning process, not something a spray treats. RHS's suggested steps, pruning for light, thinning young fruit, and choosing a warm sheltered spot, work by addressing the conditions the drop responds to, not by treating the drop itself.
Do all cherry varieties drop fruit the same amount?
No. Pacific Northwest Extension names 'Sweetheart' specifically as a cultivar that sheds more fruit than others, regardless of growing conditions. That's worth knowing if you're choosing a variety and want to minimise the problem, though neither source ranks cultivar choice against weather or pollination as causes, so it isn't clear how much difference variety alone makes next to a genuinely bad spring.
Sources
2 sources, recorded with what each was used for
- RHS: identification, the 2000 90%-loss figure, named climatic causes, and the pruning/thinning/siting controls
- Pacific Northwest Extension: independent corroboration under the same 'Cherry Run Off' name, the three-stage drop timing, the named 'Sweetheart' cultivar tendency, the wider range of possible mechanisms, and the no-cultural-control-needed stance