Large-flowered coreopsis is usually sown in spring and autumn. The temperature needs to be controlled between 10 and 15°C, and a mixed soil containing sand, gravel, round soil, perlite, and humus should be selected. When sowing, keep the distance between seeds at 10 to 20 cm, and cover the soil with a thickness of 1.5 to 2 cm. Compact the soil, water it once and cover it with a thin plastic film to keep the soil moist. Large-flowered Coreopsis is sown in spring and autumn

Large-flowered Coreopsis is mainly sown in April to May and September to October. When sowing, the temperature needs to be controlled between 10 and 15°C, and a mixed soil containing sand, gravel, round soil, perlite, and humus needs to be selected. A small amount of decomposed and fermented fertilizer should be applied to the bottom of the soil. How to sow coreopsis grandiflora

Coreopsis grandiflora is usually collected from the inflorescences with mature fruits between August and October, and washed with clean water. Place in a ventilated and cool place to dry, then soak in hot water for 4 to 5 hours, then mix the seeds with wet river sand for germination.

Wait until the seeds germinate before sowing. When sowing, spread the seeds evenly in the soil, keep the distance between the seeds at 10 to 20 cm, and cover the soil with a thickness of 1.5 to 2 cm. The soil needs to be compacted. After watering once, cover it with a thin plastic film to keep it in place. Keep the soil moist and place it in a ventilated and cool place for cultivation.

There is no need to keep watering after sowing. Wait until the plants grow for 5 to 7 days before starting normal watering. Wait until the plants grow for 15 to 20 days before applying a small amount of nitrogen and phosphorus compound fertilizer. During the seedling stage of Coreopsis grandiflora, topping must be carried out to ensure better branch growth of the plant.