Ground Cherry

Ground cherry (Physalis grisea), also called strawberry ground-cherry or downy ground-cherry, is a compact fruiting plant from the nightshade family bearing small, sweet, golden fruits enclosed in papery straw-coloured husks. Its downy, softly grey-green foliage is characteristic of the species. It thrives in warm, sunny and sheltered positions and requires a long growing season, making indoor pre-cultivation essential in Nordic conditions. The home-grown fruit is markedly more flavourful than commercially sold physalis.

Growing

Start seeds indoors 7–8 weeks before transplanting outdoors. Sow at a depth of 0.5 cm into moist seed compost — seeds require light to germinate, so do not bury deeply. Maintain a germination temperature of 26–27 °C; at this temperature germination can occur faster than the standard 14–20 days, but the substrate must never dry out. A brief cool period can break dormancy in stubborn seeds. Once seedlings emerge, grow on at around 18–20 °C in a bright, well-ventilated space. Transplant once all frost risk has passed and nights stay consistently above 10 °C, spacing plants 50–60 cm apart in rows 60–70 cm apart. Choose a warm, sheltered, sunny position — a greenhouse or a sunny protected outdoor bed both work well.

Care

Water consistently and do not allow the soil to dry out, particularly during fruit set. Feed with a balanced liquid fertiliser every two weeks once plants are established. Plants can reach 30–100 cm and may benefit from light staking in exposed positions. Pinch out the growing tip once plants reach a good size to encourage bushing and more fruit. Ensure good air circulation to prevent fungal issues.

Harvest

Harvest when the papery husk has turned fully straw-yellow and the fruit inside has coloured to a deep golden yellow. Ripe fruits often fall to the ground — check beneath plants regularly and collect fallen fruits. The husk protects the fruit and harvest continues until the first frost ends the season.

In the kitchen

Remove the papery husk and rinse off the slightly sticky skin before eating. Gyllenbär is delicious eaten fresh as a snack or in fruit salads. Its sweet, slightly tropical flavour also works well in jams, chutneys, salsas, and baked goods. It can be used in both sweet and savoury preparations.

Storing

Store unwashed fruits in their husks at room temperature for up to 2 weeks, or in the refrigerator for up to 4 weeks. For longer storage, dry the fruits whole in their husks or freeze them after removing the husks. They can also be made into jam or preserves.