Poinsettia is usually cut in clay pots or sinks, and both tender branches and dormant branches can be used. Cutting should be carried out after flowering in early spring, using dormant branches, each cutting 10 cm. Dry for 2-3 days after cutting, or fully dry the milk to be cut, treat the cutting mouth with soot, insert the cutting into plain sandy soil, the cutting depth is 1/3 of the cutting length, and the plant spacing is about 5 cm, water and stand.

Ventilation in the semi-shade, the temperature is kept at 15 ~ 20℃, and the basin soil is kept dry and wet. New roots can be born in about a month. When the new shoots grow to 10 cm, they can be planted in small flowerpots.

Second, the preparation of culture soil

Poinsettia likes loose and well-drained soil. Generally, 3 parts of vegetable garden soil, 3 parts of humus soil, 3 parts of humus soil, decomposed cake fertilizer 1 part, and a small amount of slag are used together.

Third, temperature.

Poinsettia prefers warm to cold. When entering the room in the middle and late September every year, it is necessary to strengthen ventilation to make plants gradually adapt to the indoor environment, and the room temperature should be kept at 15℃ to 20℃ in winter. At this time, it is in the stage of bract discoloration and flower bud differentiation. If the room temperature is lower than 15℃, flowers and leaves will be stunted. In mid-June, it will be in full bloom after 5438+February, and it should be ventilated gradually.

Fourth, light.

Poinsettia likes sunshine and strong phototropism, belonging to short-day plants. Adequate light should be obtained all the year round, and the discoloration of bracts, flower bud differentiation and flowering period are more important. If the light is insufficient, the branches are easy to grow white, easy to get sick and dim in color. If they are kept in the shade for a long time, they won't bloom and fall leaves in winter. In order to advance or delay flowering, you can control the light, usually every day.

Give it 8 to 9 hours of light and it will bloom in 40 days.

Verb (abbreviation for verb) fertilization

Poinsettia likes fertile sand. In addition to adding organic fertilizer and horseshoe slices as base fertilizer when releasing and changing pots, in the growing and flowering season, apply 5 times diluted and fully decomposed sesame paste liquid fertilizer every 10 ~ 15 days. After autumn, you can also apply/kloc-0 0.3% compound fertilizer once a week for 3 ~ 4 times in a row to promote the discoloration of bracts and flower bud differentiation.

Six, watering

Poinsettia is not resistant to drought and humidity, so watering should be flexibly controlled according to the weather, soil and plant growth. Generally, water should be used to keep the soil moist without water accumulation, but water should be reduced after flowering.

Seven, plastic pruning

Before and after Tomb-Sweeping Day, the dormant old plants were changed into pots, old roots and weak branches were cut off, and new techniques were popularized to germinate. In the process of growing up, you need to pick your heart twice. The first time is in late June and the second time is in mid-August. Large amount of fertilizer and water should be controlled in cultivation, especially before the plant is finalized in autumn. When the branches grow to 20 to 30 centimeters, they will be shaped and bent. The purpose is to make the plants short, the flower heads neat and evenly distributed, and improve the ornamental value.