Sticky buds are forming on the horse chestnut trees Aesculus hippocastanum. Although it was a long time ago, I remember that one of my first science lessons at secondary school was drawing the sticky buds then putting them in water and watching the buds gradually unfold. The sticky sap may protect the buds from insect damage.
Close-up showing the horseshoe shaped leaf scar. It's possible that this may be how the tree got its name.
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