Vegetable · Solanaceae
Ground Cherry
Physalis pruinosa
Let the husks dry, drop, and turn gold, and the ground cherry hands you a sweet treat all season.
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. Each small fruit grows wrapped in a papery husk like a tiny lantern, and the plant is easy enough that it suits a first-time grower. Gardeners also know it as the husk cherry, husk tomato, or strawberry tomato.
What sets it apart is how you harvest it. You don't pick the fruit off the plant. Instead you wait for the husks to dry to a thin, papery brown and the golden ripe berries to drop on their own, then gather them off the ground. That ripe fruit tastes sweet and a little tropical, somewhere between a tomato and a pineapple.
One warning rides along with the sweetness. Only the fully ripe golden fruit is safe to eat, while the green unripe fruit, the husk, the leaves, and the stems hold solanine and will make you sick. Grow it for the candy-sweet harvest, but treat every green part as off-limits.
Care
The short version: full sun, with a little shade tolerated. Keep the soil evenly moist at about an inch a week, plant in rich, well-drained ground, and give the sprawling plants room to breathe.
Light
Ground cherries crop best in full sun, with 6 or more hours of direct light a day. They tolerate a little partial shade, but the more sun they get, the more fruit you'll gather.
Water
Aim for steady, even moisture, about an inch of water a week, which keeps the fruit filling out uniformly. Established plants shrug off some heat and drought, so don't drown them. Water at the base rather than overhead, since wet leaves invite disease.
Soil
Plant in fertile, well-drained loam with plenty of organic matter dug in. 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 drives fruit set, so cool spells early in the season slow them down.
Humidity
Average air suits them, roughly 40% to 70%, and there's no need to fuss over the number outdoors. Good airflow matters far more, since crowded, damp leaves are how disease takes hold.
Feeding
Feed monthly through the growing season with a balanced, low-nitrogen food or compost. Too much nitrogen grows a leafy plant with few fruit, so go easy.
Pruning
These plants need little pruning. Pinch or stake the sprawling stems to keep the fruit off wet soil and let air move through, and clip out any diseased foliage as it shows up.
Repotting
Start seedlings in cells or pots and move them once into the garden. They aren't kept on as repotted houseplants, so the 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. Give each one 18 to 24 inches of room so air can move and the sprawling stems have support.
When to plant
Ground cherries want warmth and won't take frost. Start the seeds indoors in early spring, set the plants out a few weeks after the last frost once the soil has warmed, and gather 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 up on the leaves or in thin, empty husks. 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
Most of this damage comes from tomato hornworms, the big green caterpillars that can clear a stem overnight, though small jumping flea beetles and Colorado potato beetles also riddle the leaves. Pick the hornworms and beetles off by hand, and cover young transplants with row cover until they toughen up. Scout often and rotate away from other nightshades so the pests don't build up.
Fix:
- Handpick hornworms and beetles
- Use row cover on young transplants
- Apply an approved insecticide only if damage is severe
Lots of husks but hardly any fruit inside
When a plant grows lush and dark green but barely sets fruit, the usual culprit is too much nitrogen pushing leaves instead of flowers. Cool weather and weak early pollination can leave the husks flat and empty too. Cut the high-nitrogen feeding, keep the moisture even, and give the plants warmth and time to come into bearing.
Fix:
- Stop high-nitrogen feeding
- Keep moisture even
- Allow plants time and warmth to set fruit
Yellowing leaves marked with dark spots or wilt
Dark spots ringed like a target and yellowing lower leaves point to early blight and the other leaf diseases that run through nightshades, while sudden one-sided wilting suggests verticillium wilt or tobacco mosaic virus. Strip off the affected leaves, water at the base instead of over the top, and pull any plant that wilts for good. Rotating out of solanaceous beds and spacing for airflow keeps it from coming back.
Fix:
- Remove affected foliage
- Avoid overhead watering
- Rotate crops and remove infected plants
Sprawling stems dropping fruit into the mud
Ground cherries are low, spreading plants by nature, and crowding or wind only makes them flop harder, leaving the husks resting in wet soil. Stake or cage them early and tuck a layer of mulch underneath so the fallen fruit stays clean. Spacing each plant 18 to 24 inches apart gives them room and light support from the start.
Fix:
- Stake or cage plants
- Mulch underneath to keep fallen fruit clean
- Space plants 18-24 inches apart
Toxicity
The ripe fruit is a treat, but the rest of the plant is not. The unripe green fruit, the 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 chews the leaves or an unripe husk fruit may drool, vomit, or pass loose stools. Keep the foliage and any green windfall out of reach.
Dogs Caution
Dogs that nibble the green parts often show drooling, an upset stomach, and a flat, tired mood. Pick up fallen green fruit where a dog browses.
Horses Caution
The solanine 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 foliage and unripe fruit aren't safe browse for rabbits and can bring on digestive upset. Don't offer trimmings from the plant.
Livestock Caution
Cattle, goats, and sheep can react to the alkaloids in the green plant with stomach trouble and weakness. Fence them out of any patch.
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 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 unripe green fruit, the 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, but they differ in size and sweetness. These are the ones worth knowing by name.
Aunt Molly's
A Polish heirloom that gardeners reach for because it sets sweet golden fruit reliably and seeds itself back year after year.
Cossack Pineapple
A ground cherry grown for its intense, almost pineapple-like sweetness.
Cape gooseberry (Physalis peruviana)
A taller, upright cousin grown as an annual that carries bigger orange-gold berries than the low, sprawling husk cherry.
How to propagate
Ground cherries are simple to raise from seed, and once they fruit they tend to plant 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
Start ground cherries from seed much as you would tomatoes. Sow about a quarter inch deep in a sterile soilless mix 6 to 8 weeks before your last frost, and keep the tray warm at 75°F to 85°F (24°C to 29°C), where the seeds sprout in 2 to 3 weeks and reach transplant size in another 6 to 8. Harden the seedlings off and set them out after the frost has passed. Once they fruit, the plants self-sow freely from any berries that drop and rot in place.
Myths
The whole plant is poisonous, so even the fruit is unsafe to eat.
The fully ripe golden fruit is sweet and good to eat. It's the unripe green fruit, the husk, the leaves, and the stems that hold solanine-type alkaloids and should never be eaten.
The papery husk is part of the fruit you eat.
The husk is just a wrapper and gets tossed. Only the ripe berry inside is eaten, once you peel the dry, papery shell away.