Aesculus hippocastanum
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The seeds are toxic raw; the spiny husk resembles sweet chestnut but the nut is not edible.
Ask an adult
Opposite, palmately compound leaf of 5–7 leaflets
Leaflets narrow at the base and widest near the tip, irregularly toothed
Large brown buds, sticky with resin, at the shoot tips in winter
Fruit a green husk with sparse thick spines holding 1–3 glossy brown seeds