Swiss Chard Growing Information Capsicum annuum Direct Seed or Transplant: Start indoors 4-5 weeks before desired transplant date, after last heavy frost, or direct seed after last heavy frost. Soil temperature for germination is 45-75° F. Spacing: 6-8" in rows that are 18-24" apart for bunching. For baby leaf, direct seed in rows or bands that are 4” apart at ½" depth. Growth needs: Grows best in cooler temperatures. Overwinters in mild climates. Harvest: When leaves are of desired size, harvesting often to encourage new growth.. Storage: Dunk or wash with cold water quickly after harvest to prevent wilted leaves. Store in bags in cooler at 36° F with 95% relative humidity for 7-12 days.