Vegetable · Solanaceae
Ground Cherry
Physalis pruinosa
Once those husks go papery and fall, the ground cherry keeps the sweet snacks coming right through the season.
Full sun
Every 3–7 days
59–86°F · 15–30°C
70–90 days
Overview
So what's a ground cherry? It's a low, sprawling member of the nightshade family, a close cousin of the tomato and tomatillo, and it's easygoing enough for a first-time grower. Each little fruit comes wrapped in a papery husk that looks like a tiny lantern. You'll also see it called the husk cherry, husk tomato, or strawberry tomato.
Here's the fun twist, though: you don't pick the fruit off the plant at all. You just wait for the husks to dry to a thin, papery brown and the golden berries to drop on their own, then you gather them up off the ground. That ripe fruit tastes sweet and a little tropical, sort of between a tomato and a pineapple.
One heads-up comes with all that sweetness. Only the fully ripe golden fruit is safe to eat, and the green unripe fruit, the husk, the leaves, and the stems have solanine in them and will make you sick. So grow it for the candy-sweet harvest, but treat every green part as off-limits.
Care
The short version: full sun, though a bit of shade is fine, keep the soil evenly moist at about an inch a week, plant it in rich, well-drained ground, and give the sprawling plants room to breathe.
Light
Ground cherries crop best in full sun, so aim for 6 or more hours of direct light a day. They'll take a bit of partial shade, but the more sun they get, the more fruit you'll end up with.
Water
Go for steady, even moisture, about an inch of water a week, and the fruit fills out nicely and evenly. Once they're established they shrug off a little heat and drought, so there's no need to drown them. Water at the base rather than over the top, since wet leaves are what invite disease.
Soil
Plant them in fertile, well-drained loam with plenty of organic matter dug in. A pH of 6.0 to 6.8, just a touch acidic, is right where they like it.
Temperature
They're happy from 59°F to 86°F (15°C to 30°C). Warmth is what really gets the fruit going, so a cool spell early on will slow them down for a while.
Humidity
Regular outdoor air is plenty, roughly 40% to 70%, and there's no reason to fuss over the number. Airflow matters way more, since crowded, damp leaves are how disease sneaks in.
Feeding
Feed monthly through the growing season with a balanced, low-nitrogen food or compost. Too much nitrogen just grows a leafy plant with barely any fruit, so keep it light.
Pruning
These barely need pruning at all. Pinch or stake the sprawling stems to keep the fruit off wet soil and let air move through, and snip out any diseased foliage as it turns up.
Repotting
Start the 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'll need.
Size & spacing
Plants get to 18 to 35 inches (45 to 90 cm) tall and spread about the same. Give each one 18 to 24 inches of room so air can move and those sprawling stems get a bit of support.
When to plant
Ground cherries love warmth and can't handle frost, plain and simple. Start the seeds indoors in early spring, move the plants out a few weeks after the last frost once the soil's warmed up, 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 turns up on the leaves or as thin, empty husks, and the good thing is it's easy to spot. Catch it early and you can step in before a little problem spreads. Find what matches below, then act while it still helps.
Chewed holes and stripped leaves
Seeing ragged holes overnight? That's usually tomato hornworms, those big green caterpillars that can clear a whole stem while you sleep, though little hopping flea beetles and Colorado potato beetles chew away too. The easiest fix is to pick the hornworms and beetles off by hand, and to slip a row cover over young transplants until they toughen up. Keep an eye out and move the patch away from other nightshades, and the pests won't get a chance to pile up.
Fix:
- Handpick hornworms and beetles
- Use row cover on young transplants
- Apply an approved insecticide only if damage is severe
Husks everywhere, but where's the fruit?
So the plant's big, dark green, and gorgeous, but where's the fruit? Nine times out of ten that's too much nitrogen, which coaxes out leaves instead of flowers. A cold start or thin early pollination can leave those husks flat too. Just back off the high-nitrogen feed, keep the water even, and let some warmth and a little patience bring the fruit along.
Fix:
- Stop high-nitrogen feeding
- Keep moisture even
- Allow plants time and warmth to set fruit
Yellow leaves with dark patches, or plants wilting fast
Dark spots ringed like little targets, with the lower leaves going yellow? That's early blight and the leaf diseases that make the rounds through nightshades, while a sudden one-sided wilt is more like verticillium wilt or tobacco mosaic virus. Strip off the leaves that are affected, water down at the base instead of over the top, and pull any plant that wilts for good. Then rotate out of nightshade beds and space things for airflow, and it's a lot less likely to come back.
Fix:
- Remove affected foliage
- Avoid overhead watering
- Rotate crops and remove infected plants
Plants flopping over and dumping berries in the dirt
Don't panic if the plants sprawl all over, because they're just low and spreading by nature, and a bit of crowding or wind tips them further so the husks end up in wet soil. Pop a stake or cage in early and tuck some mulch underneath, and the fallen fruit stays clean. Give each plant 18 to 24 inches of space and they'll lean on that little bit of support right 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's a real treat, but the rest of the plant isn't for eating. The unripe green fruit, the husk, the leaves, and the stems all have a natural compound called solanine that upsets the stomach. So 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
If a cat chews a leaf or a green husk fruit, it might drool, throw up, or get loose stools. So keep the foliage and any green windfall somewhere the cat can't get to.
Dogs Caution
A dog that grabs a mouthful of the green parts will often drool, feel sick, and go a bit flat and tired. It's worth picking up fallen green fruit wherever a dog likes to roam.
Horses Caution
The solanine in the leaves and stems can put a horse off its feed and leave it dull and wobbly, so it's best to keep grazing animals away from the plants.
Rabbits Caution
The foliage and unripe fruit aren't safe browse for rabbits, and they'll bring on a queasy tummy. So don't hand them trimmings from the plant.
Livestock Caution
Cattle, goats, and sheep can react to the alkaloids in the green plant with a sore stomach and weakness. Fencing them out of any patch is the simple answer.
Birds Caution
Play it safe and treat the green parts as off-limits for backyard hens and other birds, since it's the same toxin at work. A bird can peck a fully ripe berry without any trouble.
People Ripe fruit safe
The fully ripe golden berry, once it's husked and dropped off the plant, is sweet and totally safe to eat. But the green unripe fruit, the husk, the leaves, and the stems have solanine in them and will upset your stomach, so keep kids 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 handful of ground cherries show up in gardens, but they're not all the same, differing in size and sweetness. Here are the ones worth knowing by name.
Aunt Molly's
It's a Polish heirloom gardeners keep coming back to because it sets sweet golden fruit like clockwork and reseeds itself year after year.
Cossack Pineapple
This one's grown for a rich, almost pineapple-like sweetness that's hard to stop snacking on.
Cape gooseberry (Physalis peruviana)
It's a taller, upright cousin grown as an annual, and it carries bigger orange-gold berries than the low, sprawling husk cherry.
How to propagate
Ground cherries are easy to raise from seed, and the best part? Once they fruit, they pretty much plant next year's crop 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
If you've ever grown tomatoes from seed, you already know how to do ground cherries. Sow them about a quarter inch deep in a sterile soilless mix 6 to 8 weeks before your last frost, and keep the tray toasty at 75°F to 85°F (24°C to 29°C), where they sprout in 2 to 3 weeks and reach transplant size in another 6 to 8. Harden the seedlings off, then set them out once the frost's behind you. And here's the fun part: once they fruit, they self-sow freely from any berries that drop and rot in place, so next year kind of takes care of itself.
Myths
The plant's poisonous all over, so you shouldn't eat the berries either.
Good news: the fully ripe golden fruit is sweet and perfectly fine to eat. It's the unripe green fruit, the husk, the leaves, and the stems that carry solanine-type alkaloids, and those you leave alone.
That papery wrapper? It's edible, and it goes down with the berry.
Nope, the husk is just a wrapper, and it goes in the compost. You only eat the ripe berry inside, once you've peeled that dry, papery shell off.