Physalis philadelphica Originated in Mexico and are still important in the cuisine. High pectin content. Grow two or more plants for better production. Start seed indoors 4 to 6 weeks before last frost and transplant when the soil warms. Green varieties are tart, those ripening to purple are slightly sweeter. Good source of vitamin C. Approx.15300 seeds per ounce, 540 seeds per gram.