
Photo by Public domain (iNaturalist) on iNaturalist · CC0 (public domain)
Sambucus nigra
Mildly. Raw berries, and the seeds and green parts, contain compounds that cause nausea, vomiting and diarrhoea. The ripe berries are eaten cooked; never eat the leaves or stalks.
In late August and September in most of Europe, when the clusters hang heavy and every berry is purple-black.
Elder is a woody shrub or small tree with corky bark and drooping berry heads. Dwarf elder (danewort) is a herb 1–2 m (3–6 ft) tall that dies back to the ground every winter, grows in patches, smells foul when bruised and holds its berry heads upright. Every part of dwarf elder is poisonous.
Only cooked, in syrups, jams and pies. Raw berries, leaves and stalks make people sick, and children are the ones most likely to graze on a hedge — teach them that elderberries go in the pot first.
Found in these regions
Hardiness zones 5–9.
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Also ready in October

Castanea sativa
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.
How to know it & its look-alikes →Photo: John Powers · CC BY 4.0

Sorbus aucuparia
A slim tree with smooth silvery-grey bark and feathery leaves of many toothed leaflets in pairs; big flat clusters of scarlet-orange berries, each about 1 cm (⅜ in) across with a tiny black five-pointed star at the tip.
How to know it & its look-alikes →Photo: Therese Phillips · CC BY 4.0

Hippophae rhamnoides
A thorny shrub with narrow, silvery-grey, willow-like leaves and branches packed with bright orange berries 6–8 mm (¼ in) across, from late summer into winter. Only female bushes fruit.
How to know it & its look-alikes →Checked against these sources ·
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.