How to Start Ground Cherries From Seed
Ground cherries are warm-season plants related to tomatoes, and indoor starting gives them a useful head start. Their fruits mature inside papery husks and are ready when the husks dry and fall to the ground.
Start indoors or direct sow?
Start indoors and transplant, especially in short-season regions, because seedlings need a long warm growing season. Direct sowing is possible only where summers are long and reliably warm, but it delays harvest.
When to start Ground Cherries seeds
Sow indoors 6 to 8 weeks before the last spring frost. Set plants out 1 to 2 weeks after the last frost, after nighttime temperatures are consistently mild.
How to sow the seeds
Sow seeds 1/4 inch deep in a sterile seed-starting mix in cell packs or 2-inch pots with drainage. Keep them warm on a heat mat if needed, then pot up crowded seedlings before roots become tight.
Germination
Germination usually takes 7 to 14 days, though it can be slower in cool mix. Maintain soil temperatures around 70 to 85 F and keep the mix consistently moist, not wet.
Seedling care
After emergence, provide very bright light and keep the tops of the plants a few inches below grow lights. Water at the base when needed, thin to one seedling per cell, and use airflow plus clean equipment to prevent damping off.
Transplanting & hardening off
Harden plants off over 7 to 10 days, gradually increasing sun and outdoor exposure. Transplant after frost danger has passed, setting plants at the same depth they grew in their pots and spacing them about 18 to 24 inches apart.
Tips
Do not rush plants into cold soil, since chilling slows warm-season crops. Label seedlings carefully, because young ground cherries resemble other members of the tomato family.
General seed-starting guidance for US home gardens; timing depends on your local frost dates and variety. Page updated Aug 4, 2026.