How to break the dormancy period of Chinese rose in summer and let your Chinese rose grow sturdily?

First, determine whether you are a potted rose. As soon as the potted rose period is over, it enters the hot and humid summer, and it is mostly in a dormant and semi-dormant state. Strengthening the summer management and rejuvenation maintenance of potted rose can break the dormancy period and make it bloom continuously throughout the summer. There is another very important thing that needs to be confirmed by the flower friends who potted the rose: most of the flower friends don't match the pots well, and they don't turn over the pots in spring, and the nutrients in the original pots have been exhausted. In this way, the rose could not bear the high temperature and died. Roses are almost semi-dormant in summer and high temperature season. Some growers think that it is because of the lack of fertility when they see that the rose does not bloom or blooms less, so they apply more chemical fertilizers and concentrated fertilizers, and the high temperature in summer promotes the accelerated fermentation of chemical fertilizers, which will burn the root system of the rose and eventually lead to the death of potted rose in summer. Don't forget to dig the soil next year, lazy people can't raise good flowers.

After turning over the pots and changing the soil, it should be kept in the shade for about a week before normal culture can be carried out. Remove the hardened soil and replace it with loose culture soil.

Fertilization should be controlled, light fertilizer solution should be applied once every 15 ~ 20 days, and the amount of fertilization should be increased at the end of summer. Immediately wash the roots of dead roses and change the soil, cut off some branches and keep them in the shade.

As far as the whole country is concerned, from the Yellow River basin to the vast areas in the north, the summer heat period is short and properly managed, and summer flowers and autumn flowers can compete repeatedly; However, from the Yangtze River basin to the south, the high temperature lasts for a long time, and the light intensity sometimes approaches or even exceeds the saturation point of Chinese rose, so that plant growth is inhibited, a large number of pests and diseases occur, and management is more difficult. In summer, the temperature can reach above 35 to 40 degrees. At this time, the flowering period of Chinese rose is poor, with small flowers, light colors and few petals. If some necessary measures are taken, this situation will be greatly improved.

If you want to see summer flowers and lay a good foundation for the second flowering period around October 1, you must pay attention to the following points when the summer heat comes:

(1) Pay attention to pruning after Chinese flowering. Flowers in spring are easy to bear fruit, such as' Elizabeth', and the seed setting rate is quite high without artificial pollination. This period is the golden age of sexual reproduction. If it is not intentional to cultivate new varieties, Chang Xia Hou should trim the residual flowers at any time. Varieties with short potted plants, such as' Sun Fairy', rose with rich flowers, miniature rose, etc., can be cut off by leaving 2mm above the five leaves in the second section under the residual flowers; Varieties with vigorous growth and high plant type, such as hybrid tea-scented roses such as' Mrs. X' and' Heir', can be cut a few more knots. During this period, grafting and cutting should be combined with pruning. The genetic genes of rose are relatively stable, and the new generation of seedlings produced by asexual reproduction can basically reflect the characteristics of the original variety.

(2) Chinese rose has strong heat resistance, but the temperature can last to 35℃ from summer to the future, and the light intensity is strong. Be sure to pay attention to sun protection at this time. Where conditions permit, shading signs with shading degree of 40% can be used for proper shading around noon. In summer, the disease of rose is serious, so it is forbidden to spray water frequently to cool down and prevent the disease from spreading. Recently, a method of protecting roots and seedlings in summer is popular at home and abroad. The soil surface at the root of Chinese rose is covered with a protective layer of about 3 cm, which is generally made of rotten sawdust, moss, rice husk and so on. Practice has proved that this is of great benefit to every month and every season in summer. On the one hand, it increases the content of organic humus in the soil, on the other hand, it has the function of preserving moisture and cooling down.

(3) Chinese rose is a very drought-tolerant plant, but we must attach great importance to watering potted Chinese rose. It is most suitable to water it once every morning at nine o'clock. Dry basin soil at night is beneficial to root respiration and provide energy in time; After flowering in the morning, adding water can not only reduce the temperature, but also make plants lose water at high temperature. Fertilization should not be too thick in summer, and it is advisable to apply thin fertilizer once a week. After autumn, the amount of fertilizer can be gradually increased. Do not use immature organic fertilizer, otherwise it will cause root burning and death at high temperature.

(4) Summer flowers are of poor quality, short flowering period and little ornamental value. It usually peaks in the hot season. Flowers are not allowed. The capping starts from the bud under the residual flower, and gradually peels off from top to bottom when budding. It is not allowed to cut it off at one time, otherwise the growth potential will be weakened. In mid-August, bud peeling was stopped. This can promote the flowering of new branches in the lower part of plants.

(5) pest control. The infection rate of roses is the highest and the pests are very serious. If you are not careful, all plants will be fatally hurt. Prevention is more important than cure, which is the basic principle. The high incidence periods of black spot disease and powdery mildew were May-June and 9-65438+1October respectively. In addition, gray mold, rust, branch blight and mosaic disease also occur occasionally. The medicine must be sprayed every 7 days (10 day) throughout the summer, and sulfur stone mixture (0.3 Baume -0.5 Baume), Bordeaux mixture (0.6 times), carbendazim, bacteria, etc. can be selected. The most harmful pests are two-leaf wax and aphids, as well as several leaf-eating pests and stem borers. The harm of stem borers is not great, but the result is fatal, so we must pay attention to it. The medicine can be dimethoate, dichlorvos, triamcinolone acetonide, etc. , diluted by 1000 times.

1, shading and ventilation. The soil of potted rose is limited, and it is easy to dry out in hot weather, so it is necessary to shade the rose and cool it down. It is best to put potted flowers in a ventilated place under trees or scaffolding in the courtyard from 8 am to 4 pm, so that potted flowers can receive scattered light and create suitable environmental conditions for the growth and flowering of Chinese roses.

2. Fertilize and water more. Roses bloom many times and need to be supplied with enough nutrients and water to ensure their vigorous growth. In summer, evaporation is large, consumption is large, and it grows rapidly. Apply thin fertilizer every 10 day at flowering stage. Bean cakes and bird droppings can also be soaked in water, and after closed fermentation, water is added for topdressing to make plants flourish and break the dormant state of Chinese rose in summer. Dried water should be used for watering, so as to reduce the temperature difference between basin soil and water. If too cold water is used, it will stimulate the root system and affect the normal development of plants.

3. Spray more water. Rose is in a semi-dormant state above 33℃, and the average temperature is 20-25℃, which is most favorable for growth. Therefore, in summer, in addition to proper shading, more water should be sprayed, preferably once in the morning and once in the afternoon, to create a humid environment and promote the growth of flowers and leaves.

4. Thinning and pruning. After the rose blooms, the branches should be cut below the third compound leaf under the flower to promote the development of strong new branches and the bud to bloom as soon as possible. Weak short branches are cut high first; Strong branches are cut and cut short to promote the weak and restrain the strong, and promote their neat flowering. The pruning length of long branches should not exceed half to avoid the slow germination of axillary buds. In addition, it is not advisable to leave too many flowers per crop, and 3-5 pots of roses are appropriate. There are too many flowers left, too many flowers are scattered, and the flowers are small, which affects the next flower.

5, loosen the soil and weed. Combined with weeding, fine wire harrow can be used to gently break the surface layer around the flowerpot to enhance the porosity and air permeability of the pot soil and promote the normal growth of the root system.

6. Control pests and diseases. The flowerpot should be frequently sprayed with 15% quicklime water or carbendazim and potassium permanganate aqueous solution for sterilization. The high temperature in the rainy season from July to August is the high incidence period of leaf spot and powdery mildew. The lime-sulfur mixture with 0.3-0.5 degree can be sprayed in Pomei, 2-3 times per week/kloc-0. If longicorn larvae are found in June and July, the branches should be cut off immediately. Other leaf-eating pests will be sprayed with monocrotophos 800 times as soon as they are found, which can kill eggs and larvae.