How to fertilize during the non-flowering period and how to prolong the flowering period of potted rose

Rose is called "queen of flowers". It has bright colors, long flowering period and long fragrance, which represents a kind of indomitable spirit. However, many rose cultivated in courtyard fail to fully tap the potential of long flowering period of rose. In order to prolong the flowering period of rose, it is actually to increase the flowering times of the same plant in the same year, and it is necessary to meet higher maintenance requirements in the aspects of cultivation medium, fertilization, pruning, pest control and so on.

Many novice roses do not know that rose flowers bloom in autumn. Generally speaking, most rose flowers are in full bloom in many seasons. After the summer high temperature period, the rose will enter an autumn blooming period. Flowering usually occurs in the early and middle of October (there are differences in climate between different places), so we have to seize the opportunity of the formation of climate change conditions to cultivate flowering branches.

Theoretical calculation of the total amount of branches and flowers of normal potted rose (abundant flower rose, shrub rose):

Five primary main branches (including basal branches) were cultured, with 3 secondary branches on each main branch and 2 tertiary branches on each secondary branch. if all the tertiary branches could blossom at the same time, the flowering number of the tertiary branches would be 30. Note: only the main buds are calculated, but not the long secondary buds; it is difficult to achieve such a sufficient and accurate flowering quantity of open-air potted roses.

1. Insist on changing the basin soil every year. The basin soil was replaced by the dormancy of rose in winter and spring and the initial stage of new bud germination, and the new nutrient soil was added to keep the basin soil loose. When changing the basin soil, it is necessary to remove weeds, cut off the residual roots, dredge the roots and make them produce more new roots.

2. Improve the ability of supplying fertilizer. When changing the basin soil, some mature organic fertilizer was applied at the bottom of the basin, and the thin rotten cake fertilizer was applied every 10-15 days during the peak growth period of rose. Apply nitrogen, phosphorus and potassium compound fertilizer once after flowering, increase available phosphorus fertilizer for those with little or no flowering, apply only phosphorus and potassium fertilizer but not nitrogen fertilizer after autumn, and apply no or less fertilizer in summer and winter.

3. Pay attention to adjust the temperature and light. Rose originally likes temperature and light, but the hot season should move the potted rose to a shady place, or cover the potted soil with grass to cool down. At the same time, it should be watered frequently, twice a day in summer.

4. Prune branches frequently. After flowering, the rose should be cut below the third compound leaf under the flower to promote strong new branches and bud and blossom as soon as possible. Key points of pruning techniques: weak short branches are cut first and high cut; strong branches are then cut and cut short to promote the weak and suppress the strong and promote its neat flowering. The pruning length of long branches should not exceed 1 prime 2 to avoid slow germination of axillary buds.

5. Eliminate insect pests. In spring, the rose is prone to aphids, which can be watered with cigarette butts or diluted with trichlorfon, and the pest can be eliminated in half a day; black spot and powdery mildew in summer are all caused by too humid and muggy heat, and some diseased leaves can be removed mildly; serious ones can be sprayed with Bordeaux solution or thiophanate or carbendazim for 2-3 times every 10 days or so.