How to grow Coreopsis large-flowered

Farming methods

soil

Coreopsis large-flowered is not very demanding on soil. It prefers fertile, moist and well-drained sandy loam. It can grow on soils with a pH value of 5 to 8 formed by weathering of shale, granite, sandstone and limestone. It grows best in soils with a pH value of 5 to 7 formed by weathering of granite.

Water and fertilizer management

Watering: Coreopsis grandiflora is drought-tolerant but afraid of waterlogging, so drainage should be carried out in time after rain.

Fertilization: Apply nitrogen fertilizer 2 to 3 times during the growing season, and use phosphorus and potassium fertilizers together with nitrogen fertilizer. If you want the coreopsis to bloom more, you can pick off the withered flowers after they bloom, and apply fertilizer once in July and August. The coreopsis will be lush and colorful by National Day. Coreopsis grows lushly in fertile soil, but blooms less. Therefore, in order to achieve good flowering effects, fertilization should be moderate and not excessive.

Ventilation treatment

What needs to be noted when raising Coreopsis grandiflora is that indoor cultivation must be well ventilated to make full use of the conversion of carbon dioxide and oxygen to allow the plant to breathe better and grow well.

Reproduction method

Coreopsis large-flowered has the ability to self-seed and reproduce. The seeds of wild varieties can fly with the wind and then reproduce successfully. Therefore, its general method of reproduction is sowing.

Precautions for domestication

prune

The plant of Coreopsis grandiflora is tall and needs to be pinched and pruned to maintain its beautiful shape. Pinch the heart once when the plant is 6 cm tall, and pinch the heart a second time when the branches are 10 cm long, and remove the willow buds in time.

Seed collection and preservation

Coreopsis large-flowered is suitable for sowing and propagation, and seed collection and preservation are very important. Between August and October each year, select the inflorescences with most of the fruits mature, cut them off, dry them in the sun to remove impurities, select the seeds, place them in a dry and cool place, and pack them in moisture-proof paper bags. Store the seeds in a dry, dark, and well-ventilated place at an ambient temperature of 10-15°C. A good germination rate can be maintained after 1-2 years.

Common pests and diseases

Common pests of Coreopsis grandiflora: aphids, cutworms, and grubs. It can be killed by spraying omethoate once every ten days.

Common diseases of Coreopsis grandiflora: powdery mildew and black spot. It can be controlled by using dimethoate emulsifiable concentrate.