Potted poinsettia pot soil should be matched with 7 parts garden soil, 3 parts decomposed cake fertilizer and green bran ash; Or 2 parts of garden soil, humus soil 1 part and compost 1 part. After the seedlings are potted, they should be given enough water and placed in a semi-cool place for about a week, then moved to an outdoor place where the sun can be seen in the morning and evening, and then placed in a sunny place for maintenance for about half a month. When the seedlings grow to 15 cm, they must be enucleated. Leave 4-5 leaves from the base, and cut off the branches to make 3-5 lateral branches grow from the base. When the branches grow to 15-20 cm, they can start to make curved shapes.
The whole growth process of poinsettia needs uniform water supply, which is both afraid of drought and waterlogging. The evaporation in spring and autumn is small, so watering should be controlled; There is a large amount of evaporation in sunny days in summer, so water should be poured once every morning and evening. Generally, the basin soil should be watered after it is dry. Water before noon in winter, and water in the afternoon will lower the soil temperature.
Poinsettia needs higher fertilizer, especially nitrogen fertilizer. In the growing period, if nitrogen is insufficient, the phenomenon of fan leaves will appear. Therefore, topdressing should start 7- 10 days after coring. It is advisable to apply light fertilizer late and avoid applying thick fertilizer once a week. Move indoors before cold dew, give sufficient light and ventilation, and keep the room temperature above 15℃. After the bud appears, when it is close to flowering, more phosphate fertilizer should be applied to make the bract leaves (flowers) colorful. After flowering, lowering the temperature to 65438 02℃ can prolong the flowering period.
Poinsettia is a short-day plant, which blooms naturally from June to February in 5438. If you want it to blossom in advance, you can treat it with short sunshine, that is, from the beginning of August, shorten the daily illumination time to 8-9 hours, so that it can blossom shortly before the National Day.
How does poinsettia make a curved shape?
Poinsettia plants grow very fast and are easy to grow white, which makes the plant type high. To this end, many flower farmers make it into an arc. Generally, start from the branch length of 18 cm, and do not water it two days before bending. The operation time should be around 6 pm, because the poinsettia is exposed for one day, and the water content of the branches decreases accordingly and becomes soft. If you bend down in the morning, the branches are brittle and easy to break. Bend the branch into an arch with a string and fix it. You can bend in different directions once every once in a while, and tie the branches into a spiral that hovers around to make the plants shorter. The last bend should be about 20 days before flowering. When doing bending modeling, pay attention to the requirement that the strong branches are placed around, the weak branches are placed in the middle, and the strong branches bend downward to a greater extent, so that the branches and leaves of plants can be evenly distributed, highly consistent, the flowers are neat, and the whole tree shape is plump and beautiful.
It is reported that in order to dwarf the plant shape of Poinsettia, in addition to the above methods, growth dwarfing agents B9 and CCC can also be used to treat leaf or soil collapse to quench thirst, thus shortening the internodes and dwarfing the plant shape.
How to change pots and trim poinsettia?
Poinsettia is suitable for changing pots and soil once a year in early spring. When changing pots, the old soil and rotten soil around the shoulder soil and the original soil lump should be eradicated, and the roots and branches should be trimmed properly. Put the bone fragments as base fertilizer into the bottom of the pot, then fill in the culture soil mixed with 3 parts humus soil, 6 parts sandy loam soil and 1 part cake fertilizer powder, and then plant plants in the pot.
After planting, water it, put it in a cool place, and move it to the sunny place for culture after 10. When the cuttings grow to a certain height in 1 year, the trunk remains about 10 cm high, and the upper part is cut off, and 2-3 lateral branches can grow in that year; If it is a perennial, you can leave 2-3 buds at the base of each lateral branch, and cut off all the upper branches to promote the germination of new branches. If new buds grow after pruning, they should be pulled out at any time. Generally, each medium-sized flowerpot can have 5-7 buds, each bud grows 1 branch, and the top of each branch opens 1 flower. If there are too many buds, thin branches and small flowers, the ornamental value will be affected.