Weird red things...
Hello,
I'm curious about these things I see on certain leaves.
I'm not overly bothered about it, as this is an a 'wild' part of the garden (code for the bit I can't yet be bothered with!), but I wonder what these red things are.
When they get older, they turn into quite big nodules on the leaves - are they beetles?
I've seen them on a hedge leaf too..

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They are galls (a reaction from the tree) caused by mites (likely in this case) or sometimes tiny wasps. They're harmless and there's nothing you can do anyway - it's just nature at work!
Ahh - found looking up galls - thanks for that.