Sweet chestnut

Castanea sativa

When: Typically October – November — October, November. Earlier in warm, low country; later in the hills.
Where it grows: Coppice and old woods on acid, well-drained soil, chestnut groves on the hills of southern Europe, and parkland trees.
How to know it: A big tree with long, glossy leaves edged with sharp, regular teeth, and bark that twists in spiralling ridges on old trunks. The nuts come in twos and threes inside a husk covered in dense, needle-sharp spines; each is glossy brown, flat on one side, with a pointed tuft at the tip.
Look-alikes: Horse chestnut is the one to know: its husk has a few short, stubby spikes, it usually holds one big round conker with a pale scar and no pointed tip, and its leaves are big hands of five to seven leaflets. Conkers are poisonous.
Harvest and use: Slit the shell and roast, boil, or dry and mill into flour. Choose plump, heavy nuts and leave the flat, empty ones.
Caution: Learn the conker before your first harvest — horse chestnuts stand in the same parks and avenues.

Sweet chestnut at a glance

Also called: Spanish chestnut, European chestnut; châtaigne or marron (France), castagna (Italy), castaña (Spain), Esskastanie (Germany)
Family: Fagaceae (beech and oak family)
Where it grows: Native to southern Europe and Anatolia (the Woodland Trust adds North Africa), and spread by people across western and central Europe. The great chestnut country is the hills of Portugal, Spain, southern France, Italy, southern Switzerland and the Balkans; in Britain it is an old introduction, common as coppice in the south-east.
When to pick: The nuts fall in October, with stragglers into November, when the spiny husks split on the tree or on the ground. The trees flower in late June and July in long, heavy-scented catkins.
Parts used: The nuts — roasted, boiled, dried or milled into flour. Husks and leaves are not eaten.

Questions people ask about sweet chestnut

How do you tell sweet chestnuts from conkers?

By the husk and the nut. Sweet chestnut husks bristle with dense, needle-sharp spines and hold two or three nuts that are flat on one side with a pointed tuft. Horse chestnut husks have a few short, stubby spikes and usually hold one big, round, glossy conker with a pale scar and no point. The leaves differ too: one long toothed blade for sweet chestnut, a hand of five to seven leaflets for horse chestnut.

Are conkers poisonous?

Yes. Raw horse chestnut seeds contain aesculin and saponins and cause sickness if eaten. Only sweet chestnuts are food.

When do sweet chestnuts fall?

In October, sometimes into November. Collect them from the ground as the husks split, and choose plump, heavy nuts.

What should children know about conkers?

That conkers are for games, not for eating — raw horse chestnuts make people sick. A sweet chestnut comes from a husk bristling with fine, needle-sharp spines and has a pointed tip; a round, glossy nut from a husk with a few stubby spikes is a conker.

Found in these regions

Hardiness zones 6–9.

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Photo: Therese Phillips · CC BY 4.0
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Photo: Public domain (iNaturalist) · CC0 (public domain)

Checked against these sources · last reviewed October 2026

Seasons are typical for the middle of the range and move by weeks north and south, and up and down hills.

Educational information only. Never eat a wild plant or mushroom identified from a single photograph or description — confirm with a regional field guide or an experienced forager, and know the poisonous species in your area first.

Sweet chestnut

Castanea sativa

When

Typically October – November — October, November. Earlier in warm, low country; later in the hills.

Where it grows

Coppice and old woods on acid, well-drained soil, chestnut groves on the hills of southern Europe, and parkland trees.

How to know it

A big tree with long, glossy leaves edged with sharp, regular teeth, and bark that twists in spiralling ridges on old trunks. The nuts come in twos and threes inside a husk covered in dense, needle-sharp spines; each is glossy brown, flat on one side, with a pointed tuft at the tip.

Look-alikes

Horse chestnut is the one to know: its husk has a few short, stubby spikes, it usually holds one big round conker with a pale scar and no pointed tip, and its leaves are big hands of five to seven leaflets. Conkers are poisonous.

Harvest and use

Slit the shell and roast, boil, or dry and mill into flour. Choose plump, heavy nuts and leave the flat, empty ones.

Caution

Learn the conker before your first harvest — horse chestnuts stand in the same parks and avenues.

Sweet chestnut at a glance

Also called

Spanish chestnut, European chestnut; châtaigne or marron (France), castagna (Italy), castaña (Spain), Esskastanie (Germany)

Family

Fagaceae (beech and oak family)

Where it grows

Native to southern Europe and Anatolia (the Woodland Trust adds North Africa), and spread by people across western and central Europe. The great chestnut country is the hills of Portugal, Spain, southern France, Italy, southern Switzerland and the Balkans; in Britain it is an old introduction, common as coppice in the south-east.

When to pick

The nuts fall in October, with stragglers into November, when the spiny husks split on the tree or on the ground. The trees flower in late June and July in long, heavy-scented catkins.

Parts used

The nuts — roasted, boiled, dried or milled into flour. Husks and leaves are not eaten.

Questions people ask about sweet chestnut