10-20 days Click to see full answer. Besides, are snapdragons easy to grow from seed?Snapdragons are easiest to grow from seed indoors in early spring. Prepare seedling pots with seed substrate (rather than regular potting soil). Scatter the seeds on the surface of the substrate and press lightly. Keep them in a warm, sunny window.Likewise, when should I plant antirrhinum seeds? Sow your Antirrhinum seeds January to May under glass in gentle heat for flowers July-October or Sow July to September in a cold frame for planting the following spring. Antirrhinum seeds should germinate within 10-20 days. Transplant your seedlings 5 cm apart in seed trays and grow on. Then, how do you germinate snapdragon seeds? Sow snapdragon seeds indoors 12 weeks before last frost using a seed starting kit. Sow seeds thinly and barely press into seed starting formula do not cover with soil. Keep the soil moist at 65 degrees, as snapdragons prefer cooler soil so do not use bottom heat. Seedlings emerge in 8-14 days.Can you grow snapdragons indoors?While snapdragons (Antirrhinum majus) are most often grown as summer annuals, they are short-lived perennials in U.S. Department of Agriculture plant hardiness zones 9 to 11. They can also be grown indoors if they are given enough sunlight. Snapdragons grow readily from seed and need minimal care to flourish.

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