Vegetable · Solanaceae
Ground Cherry
Physalis pruinosa
Papery lanterns fade to tan and split loose, spilling small golden globes onto the soil for you to gather.
Full sun
Every 3–7 days
59–86°F · 15–30°C
70–90 days
Overview
The ground cherry is a low, sprawling member of the nightshade family, a close cousin of the tomato and tomatillo, with lax green stems that lean out and settle along the soil. Each small round fruit swells inside a thin, papery husk that closes over it like a tiny green lantern, and the plant is forgiving enough for a first-time grower. Gardeners also call it the husk cherry, husk tomato, or strawberry tomato.
The way it ripens gives the harvest its charm. You never pick the fruit off the plant. You wait for those lantern husks to dry to a thin, papery brown and the smooth golden berry inside to loosen and drop on its own, then gather the fallen fruit off the ground. Peeled from its crackling shell, that ripe berry tastes sweet and a little tropical, sitting somewhere between a tomato and a pineapple.
A single warning rides with the sweetness. Only the fully ripe golden fruit is safe to eat, while the green unripe berry, the papery husk, the leaves, and the stems hold solanine and will make you sick. Grow it for that candy-sweet golden fruit, and leave every green part on the plant.
Care
The short version: full sun, with a little shade tolerated, soil kept evenly moist at about an inch a week, rich and well-drained ground, and room for the low, sprawling stems to breathe.
Light
Ground cherries fruit best in full sun, with 6 or more hours of direct light a day pouring over the sprawling green leaves. They tolerate a little partial shade, but the more sun they catch, the more golden fruit swells in the husks.
Water
Aim for steady, even moisture, about an inch of water a week, which lets each berry fill out round and full inside its husk. Established plants shrug off some heat and drought, so don't drown them. Water low at the base rather than over the leaves, since wet foliage invites disease.
Soil
Plant them in fertile, well-drained loam worked full of dark organic matter. A pH of 6.0 to 6.8, just on the acidic side, suits them well.
Temperature
They grow happily from 59°F to 86°F (15°C to 30°C). Warmth is what swells the fruit, so a cool spell early in the season stalls the ripening.
Humidity
Ordinary outdoor air suits them, roughly 40% to 70%, and the number needs no fuss. Good airflow around the low leaves matters far more, since crowded, damp foliage is how disease takes hold.
Feeding
Feed monthly through the growing season with a balanced, low-nitrogen food or compost. Too much nitrogen swells the leaves dark and lush at the expense of the fruit, so go easy.
Pruning
These sprawling plants need little pruning. Pinch or stake the lax stems to keep the husked fruit off wet soil and let air move through the low canopy, and clip out any spotted, diseased leaf as it shows.
Repotting
Start seedlings in cells or pots and move them once into the garden. They aren't kept on as repotted houseplants, so that transplant into the bed is the only move they need.
Size & spacing
Plants reach 18 to 35 inches (45 to 90 cm) tall and spread about as wide in a low, tumbling mound. Give each one 18 to 24 inches of room so air moves through and the sprawling stems find support.
When to plant
Ground cherries want warmth and won't take frost. Start the seeds indoors in early spring, set the young plants out a few weeks after the last frost once the soil has warmed, and gather the golden fruit from mid-summer into fall as the husks dry and drop.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: 6-8 weeks before the last expected spring frost
- Plant: After all danger of frost, about 2-4 weeks after the last frost once soil is warm
- Harvest: Harvest from mid-summer into fall once husks turn dry and papery and the golden ripe fruit drops to the ground
Hardiness
USDA hardiness zones: 3–9
Temperature: down to -40°C
Troubleshooting
Most ground cherry trouble shows on the leaves or in thin, empty husks with no berry swelling inside. Catch the early signs and you can step in before a small problem spreads. Match what you see below, then act while it still helps.
Chewed holes and stripped leaves
The ragged holes and bare, chewed stems are the signature of tomato hornworms, fat green caterpillars that can strip a stem down to its ribs overnight, while tiny hopping flea beetles and Colorado potato beetles leave the foliage stippled with pinholes. Pick the plump hornworms and hard-shelled beetles off by hand, and drape a light row cover over young transplants until the leaves toughen. Walk the rows often and shift the crop away from other nightshades so the pests never mass up.
Fix:
- Handpick hornworms and beetles
- Use row cover on young transplants
- Apply an approved insecticide only if damage is severe
Flat, hollow husks with scarcely a berry inside
When a plant piles on deep, glossy dark-green leaves yet the papery husks hang thin and slack, the trouble is usually too much nitrogen feeding foliage instead of flowers. Cool weather and weak early pollination leave those husks flat and hollow too, with no plump berry swelling inside. Cut the high-nitrogen feed, hold the moisture steady, and let warmth and time fill the husks out.
Fix:
- Stop high-nitrogen feeding
- Keep moisture even
- Allow plants time and warmth to set fruit
Sallow leaves stamped with dark rings or collapsing in wilt
Dark lesions ringed in concentric bands like a bullseye, spreading across yellowing lower leaves, mark early blight and the other leaf diseases that run through nightshades, while a sudden droop down one side of the plant flags verticillium wilt or tobacco mosaic virus. Snap off the spotted leaves, aim the water low at the base to keep the foliage dry, and pull any plant that wilts past saving. Rotating out of nightshade ground and spacing for airflow keeps the spots from creeping back.
Fix:
- Remove affected foliage
- Avoid overhead watering
- Rotate crops and remove infected plants
Limp, ground-hugging stems pressing husks into wet earth
Ground cherries carry a low, wide-spreading frame, their lax stems leaning outward until they lie flat along the ground, and crowding or wind only presses them down harder into the wet soil. Set a stake or cage early to lift the tangle of stems, and slip a layer of mulch beneath so each dropped, husk-wrapped fruit rests clean. Spacing the plants 18 to 24 inches apart opens the low canopy and props the sprawling stems from the start.
Fix:
- Stake or cage plants
- Mulch underneath to keep fallen fruit clean
- Space plants 18-24 inches apart
Toxicity
The ripe golden berry is a treat, but the rest of the plant is not. The green unripe fruit, the papery husk, the leaves, and the stems all hold a natural compound called solanine that upsets the stomach. Eat only the fully ripe golden berries, and keep the green parts away from children, pets, and grazing animals.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Caution
A cat that bites into a leaf or a green husk-wrapped fruit may drool, vomit, or pass loose stools. Keep the foliage and any green windfall out of reach.
Dogs Caution
A dog that mouths the green parts often drools, gets an upset stomach, and turns flat and tired. Clear fallen green fruit from wherever a dog browses.
Horses Caution
The solanine packed in the leaves and stems can leave a horse off its feed, dull, and unsteady, so keep grazing animals away from the plants.
Rabbits Caution
The leafy foliage and unripe fruit are unsafe browse for rabbits and bring on digestive upset. Never offer trimmings from the plant.
Livestock Caution
Sheep, goats, and cattle that graze the leafy green growth may develop digestive upset and a weak, unsteady bearing from the alkaloids. Keep the herd fenced well away from the planting.
Birds Caution
Treat the green parts as unsafe for backyard hens and other birds, since the same toxin is at work. A bird may peck a fully ripe golden berry without harm.
People Ripe fruit safe
The fully ripe golden berry, husked and dropped from the plant, is sweet and safe to eat. The green unripe fruit, the papery husk, the leaves, and the stems hold solanine and will upset your stomach, so keep children clear of the green plant.
Eat only the fully ripe, golden fruit that has dropped to the ground and shed its papery husk. Do not eat unripe/green fruit, the husk, leaves, or stems, which are toxic and can cause stomach upset or poisoning. Keep windfall green fruit picked up where children or pets browse.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
Only a few ground cherries turn up in gardens, and they differ in the size, color, and sweetness of the ripe berry. These are the ones worth knowing by name.
Aunt Molly's
A Polish heirloom prized for the round, sweet golden fruit it sets dependably and for reseeding itself year after year.
Cossack Pineapple
A ground cherry grown for the intense, almost pineapple-like sweetness of its ripe golden berry.
Cape gooseberry (Physalis peruviana)
A taller, upright relative grown as an annual, hanging larger orange-gold berries than the low, sprawling husk cherry.
How to propagate
Ground cherries are simple to raise from their fine, tomato-like seed, and once they fruit they scatter the next generation for you.
SeedEasy
Start indoors 6-8 weeks before the last frost; transplant after frost danger passes · About 2-3 weeks to germinate at 75-85°F and roughly 6-8 weeks to reach transplant size
The fine, tomato-like seed of the ground cherry starts the same way tomatoes do. Sow it about a quarter inch deep in a sterile soilless mix 6 to 8 weeks before your last frost, and hold the tray warm at 75°F to 85°F (24°C to 29°C), where the first green shoots break in 2 to 3 weeks and stretch to transplant size over another 6 to 8. Harden the young plants off and set them out once frost has passed. After they fruit, the plants self-sow freely from any golden berry that drops and rots into the soil in place.
Myths
Poison saturates the whole plant, berry and all, so nothing it bears is edible.
The fully ripe golden berry is sweet and good to eat. It is the green unripe fruit, the papery husk, the leaves, and the stems that hold solanine-type alkaloids and should never be eaten.
That thin, papery shell counts as edible fruit and gets swallowed with the berry.
The husk is only a dry, papery lantern wrapped around the berry, and it is tossed aside. Only the smooth ripe berry inside is eaten, once you peel that thin shell away.