? Planting Instructions: To extend the flowering period, Tall Snapdragon can be sown in spring, summer, and autumn. Prior to sowing, soak the seeds in a 0.5% potassium permanganate solution for 1-2 hours to eliminate surface pathogens. Use sterilized humus soil or peat soil as the planting substrate. Due to the small size of the seeds, mix them with fine sand for even distribution during sowing. Maintain a temperature of around 15-20C for germination, and provide shade and protection from rain on seedbeds until transplanting at 4-6 true leaves stage.