Geoff Simpson / Horse chestnut tree sticky bud opening {Aesculus hippocastanum} England

Stephen Dalton / Grey squirrel {Sciurus carolinensis} feeding on conker, UK

Silvia Reiche / Horse Chestnut (Aesculus hippocastanum) fruit, Hoogeloon, Netherlands

Silvia Reiche / Horse Chestnut (Aesculus hippocastanum) fruit, Hoogeloon, Netherlands

Silvia Reiche / Horse Chestnut (Aesculus hippocastanum) fruit, partially opened, Hoogeloon, Netherlands

Mark Taylor / Horse chestnut tree {Aesculus hippocastanum} in bloom in fields with buttercups Surrey, UK.

Jason Smalley / Horse chestnut leaves above stream {Aesculus hippocastanum} England

Jason Smalley / Horse chestnut tree in flower {Aesculus hippocastanum} England

GEORGETTE DOUWMA / Horse chestnut conkers {Aesculus hippocastanum} UK

GEORGETTE DOUWMA / Horse chestnut conkers {Aesculus hippocastanum} England

Brian Lightfoot / Horse chestnut conkers, fallen seeds (Aesculus hippocastanum) UK.

Artur Tabor / Horse chestnut nuts /conkers (Aesculus hippocastanum) Poland, Europe

Duncan Usher / Horse Chestnut (Aesculus hippocastanum) close up of new leaves budding, Europe

WILLIAM OSBORN / Horse chestnut conkers ready to fall from tree {Aesculus hippocastanum} UK

Ross Hoddinott / Horse chestnut tree leaves emerging {Aesculus hippocastanum} Cornwall, UK

Brian Lightfoot / Horse chestnut tree in flower (Aesculus hippocastanum) Scotland

Artur Tabor / Horse chestnut (Aesculus hippocastanum) ripe seeds (conkers). Poland, Europe

Christoph Becker / Horse chestnut (Aesculus hippocastanum) leaves in spring, Germany

Duncan Mcewan / Horse chestnut (Aesculus hippocastanum) opening buds. Sequence 2/2. UK, Europe

Duncan Mcewan / Horse chestnut (Aesculus hippocastanum) opening buds. Sequence 1/2. UK, Europe

Duncan Mcewan / Horse chestnut opening buds (Aesculus hippocastanum) UK

John Downer / Horse chestnut leaves (Aesculus hippocastanum) in autumn. England, UK, Europe

Niall Benvie / Horse chestnut tree leaves emerging from bud. Latvia

Niall Benvie / Conkers and Horse chestnut leaf (Aesculus hippocastanum), autumn. Scotland, UK, Europe

Niall Benvie / Horse chestnut buds bursting into leaf, Scotland, UK, Europe

Jose B. Ruiz / Horse chestnut (Aesculus hippocastanum) in flower, Spain Alicante

Brian Lightfoot / Horse chestnut tree flowers (Aesculus hippocastanum) Scotland

John Downer / Horse chestnut leaves (Aesculus hippocastanum) in autumn. England, England, UK, Europe

Niall Benvie / Horse chestnut tree flower {Aesculus hippocastanum} Scotland, UK

WILLIAM OSBORN / Horse Chestnut tree flower {Aesculus hippocastanum} UK

WILLIAM OSBORN / Horse chestnut tree {Aesculus hippocastanum} Autumn UK

Duncan Mcewan / Horse chestnut tree leaf scar + buds (Aesculus hippocastanum) UK

Artur Tabor / Horse chestnut unripe seeds (Aesculus hippocastanum) UK Conkers

Niall Benvie / Close up of horse chestnut tree bark {Aesculus hippocastanum} Scotland

Duncan Mcewan / Horse chestnut leaves emerging {Aesculus hippocastanum} Scotland, UK Perthshire

GEORGETTE DOUWMA / Horse chestnut fruit / conkers {Aesculus hippocastanum} UK

Brian Bevan / Melanistic Grey squirrel (Sciurus carolinensis) sitting in tree feeding on chestnut, Bedfordshire, UK,

Nigel Cattlin / Exposed Horse chestnut leaf-miner (Cameraria ohridella) larva in mine in tree leaf (Aesculus hippocastanum) Berkshire, England, UK, September.

Nigel Cattlin / Exposed horse chestnut leaf-miner (Cameraria ohridella) larva in mine in a tree leaf (Aesculus hippocastanum) Berkshire, England, UK, September.

Nigel Cattlin / Larva of horse chestnut leaf-miner (Cameraria ohridella) in a leaf mine in a conker leaf (Aesculus hippocastanum) leaf, Berkshire, England, UK, September.

Nigel Cattlin / Damage to horse chestnut (Aesculus hippocastanum) leaf caused by leaf-miner (Cameraria ohridella) larvae, Berkshire, September