14/08/2026
Woodland Wanderings #2 —
When branches fall from a perfectly healthy tree
There is a strange phenomenon that occurs in woodlands during hot summer weather called "Summer Branch Drop", or "Sudden Limb Drop".
It is exactly what it sounds like: a large branch can suddenly break away from a mature tree, sometimes from a tree that looks completely healthy and shows no obvious signs that anything is wrong.
The phenomenon is most often associated with long periods of hot, dry weather, followed by heavy rain, and tends to happen during warm, still conditions — often on summer afternoons.
And this is the really curious part…
Nobody knows exactly why it happens.
There are several theories involving water stress, changes in the tree and the weight or internal stresses within large limbs, but there is still no definitive explanation. As the Institute of Chartered Foresters puts it, the phenomenon is “poorly researched” and its precise mechanism is not understood.
Research going back decades describes seemingly sound limbs suddenly failing in calm summer weather. One scientific paper noted that mature trees can lose apparently healthy limbs “during or following hot calm summer afternoons” or after heavy summer rain following a period of increasing soil dryness.
So, although it is a rare and fascinating natural phenomenon, it is also one worth being aware of.
When we're working in the woods during long, hot spells, we try not to spend unnecessary time directly underneath large, spreading branches — particularly after a good downpour.
It seems slightly counterintuitive, doesn't it?
We instinctively think that a tree is most dangerous when the wind is howling and the branches are thrashing around.
But sometimes the woods can be completely still… and that's when a seemingly healthy branch can quietly let go.
Nature is full of surprises. 🌿
Woodland Wanderings — little snippets from life in our woods, and some of the things we learn along the way.