
Photo by Public domain (iNaturalist) on iNaturalist · CC0 (public domain)
Fragaria vesca
They are the same species. Alpine strawberries are garden selections of Fragaria vesca that flower and fruit all summer, often without runners; the wild plant fruits once, in early summer.
By the flowers and the fruit. Barren strawberry flowers from early spring with petals that have gaps between them and a notch at each tip, and it never makes a red berry. Wild strawberry petals are rounded and touch, and its leaves are shinier.
From June into August, depending on how far north and how high you are. They ripen a few at a time over weeks, so a patch is worth visiting more than once.
Yes, once you have shown them the plant: three shiny toothed leaflets, white flowers, and a small red berry with its seeds on the outside. Teach them to leave any red berry from a plant they can’t name, and to skip patches beside paths where dogs are walked.
Found in these regions
Hardiness zones 3–9.
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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.