Ground Cherry

Ground cherry (Physalis pruinosa) sells for $5-8/lb at farmers markets and is nearly impossible to find in grocery stores (USDA AMS Specialty Crop Market News, 2023). That supply gap is the ROI case. Grow it, show up with husked ground cherries at a farmers market table, and you will answer “what are these?” questions all morning.

What you’re actually growing

Ground cherry is a close relative of tomatillo (Physalis philadelphica) - both carry their fruit inside a papery husk, and both are in the nightshade family (Solanaceae) alongside tomato and pepper. The difference is flavor and size. Ground cherry fruit is 0.5-0.75 inches across and runs sweet-tart with tropical and vanilla undertones when fully ripe. The husk turns tan and papery at maturity; the fruit inside goes from green to golden yellow. When the fruit is ready, it drops to the ground - hence the name.

The most common market variety is ‘Aunt Molly’s,’ a Polish heirloom with good flavor and reliable yield. ‘Goldie’ and ‘Cossack Pineapple’ are also well-regarded. Growth habit resembles a sprawling indeterminate tomato: plants reach 18-24 inches tall but spread to 3-4 feet wide without support.

The ROI case

A $2.99 seed packet contains 25-50 seeds. Start seeds indoors 6-8 weeks before last frost, same timing as tomatoes. Each plant produces 200-300 fruits over the season, weighing out to 1.5-3 lb per plant (Cornell Cooperative Extension, Specialty Vegetable Crops, 2022). At $6/lb average retail and $5-8/lb at direct markets (USDA AMS, 2023), one well-managed plant returns $9-24 in gross value. Your seed cost per plant is around $0.10-0.15 at typical packet germination rates.

The advantage over tomatillo is that ground cherry fruits mature to exactly one serving size - no chopping, no mess. That convenience is part of why they command a premium at market. Buyers who taste one usually come back.

Growing requirements

Ground cherry tolerates a wider temperature range than tomato but shares the same hardiness constraints: it’s frost-sensitive and needs soil temps above 60°F to grow well. Start seeds indoors like tomatoes - 6-8 weeks before transplant date, in a sunny window or under lights, bottom heat optional but helpful.

Transplant spacing 18-24 inches in rows 36 inches apart. The plants get wide. If space is tight, a single tomato cage per plant keeps the sprawl manageable and keeps fruit off the soil.

Soil pH 6.0-7.0. Ground cherries are less fussy about fertility than tomatoes. Compost at planting and one mid-season side-dress with a balanced fertilizer is usually sufficient. Excess nitrogen, as with tomatoes, pushes foliage growth and delays fruiting.

Drought tolerance once established is better than tomato. Still, consistent moisture through fruit set prevents the fruit drop and misshapen development that uneven watering causes.

What goes wrong

Colorado potato beetle (Leptinotarsa decemlineata) feeds on all solanaceous crops including ground cherry. Yellow egg masses on the undersides of leaves hatch into orange-red larvae that defoliate plants quickly. Hand-pick eggs and larvae daily during the first flush. Spinosad or neem applied at larval stage provides organic control; Bt does not work on beetle larvae.

Aphids cluster on new growth in dense colonies. Knock them off with water. Insecticidal soap covers heavier infestations. Ground cherries are less prone to aphid pressure than pepper but more prone than tomatillo in most situations.

Flea beetles (Epitrix spp.) leave small shothole damage on leaves. Damage is mostly cosmetic at low population. Row cover at transplant in high-pressure areas keeps populations down.

Fruit that stays on the ground after dropping will germinate the following spring. This is often welcomed as a self-seeding population, but if you’re in a managed bed, clear fallen fruit weekly.

Harvest and storage

The husk turning from green to tan and the fruit dropping to the ground are your two harvest cues. You can pick husked fruit directly off the plant when the husk has turned fully tan and papery, or collect dropped fruit from a clean ground cloth. Check daily during peak season.

Ground cherries keep surprisingly well in their husks - 2-3 weeks at room temperature, 3-4 weeks refrigerated. The husk acts as natural packaging. Dehusked fruit should be used within a week.

For cooking: raw in salsas and fruit salads, cooked into jam (the pectin content is reasonable), or dried. They dry well - flavor concentrates and the result is similar to a golden raisin. Dried ground cherries at specialty food stores sell for $12-18/lb.

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Related crops: Tomatillo, Tomato

Related reading: How to Find Local Prices - checking your actual farmers market premiums before you plan what to grow