When to Sow Swiss Chard Seeds
Swiss chard seeds are special in that they can germinate in relatively cold soil, as low as 50 F. (10 C.). Swiss chard plants are somewhat frost-hardy, so the seeds can be sown outside directly in the soil about two weeks before the average last frost date of spring. If you want to get a head start, however, you can start them indoors three to four weeks before the last frost date in your area. Swiss chard is also a popular fall crop. If growing Swiss chard seeds in the fall, start them about ten weeks before the average first autumn frost date. You can sow them directly in the soil or start them indoors and transplant them out when they are at least four weeks old.
How to Plant Swiss Chard Seeds
Growing Swiss chard from seed is very easy and germination rates are usually fairly high. You can get your seeds to perform even better, however, by soaking them in water for 15 minutes immediately before sowing. Plant your Swiss chard seeds at a depth of ½ inch (1.5 cm) in rich, loosened, moist soil. If you’re starting your seeds indoors, plant the seeds in a flat bed of individual seed plugs with two to three seeds in each plug. Once the seeds have sprouted, thin them to one seedling per plug. Transplant them out when they’re 2 to 3 inches (5-7.5 cm.) tall. If you’re planting directly in the soil, plant your seeds 3 inches (7.5 cm.) apart. When the seedlings get to be several inches tall, thin them to one plant every 12 inches (30.5 cm.). You can use the thinned seedlings as salad greens.
