The characteristic of rose is to like cold and heat, to love Yang and avoid Yin, to bear fertilizer and to fear barren, and to like to grow in the soil with abundant water and fertilizer.
It can thrive in the north of the Yangtze River, but the south of the five ridges is hot and humid in summer, with a lot of diseases and insect pests, which is a great threat to the growth of roses. In the past, many florists saw that the branches and leaves were yellow and could not die for half of their lives. They thought it needed "summer sleep", so they cut off the whole branch and leaves, leaving only the basic trunk, and then urged it to sprout again when it was cool in autumn. Therefore, no matter how big or small the flower bed, they rarely saw the trace of roses. In fact, from June to September, during the period of "three volts", its plants did not sleep in, and its cells were all living tenaciously. According to the field survey, about 35000-42000 roses are planted per mu, among which 15% - 20% are planted in summer. Although the flowers in summer are smaller, they do not fail to bloom.
First of all, we should pay attention to "transplanting trees". We should use the usual cuttings to propagate, instead of using wild roses as rootstock, and take the branches and buds of improved varieties as scions. After grafting, the root group will be developed, the fertility will be strong, and the years of flower picking will be prolonged.
Secondly, "heat dissipation" should be carried out, and the soil should be cultivated in the middle, and the branches and leaves should be watered directly at noon to reduce the ground temperature.
The third is to help "health and health". Take the initiative to attack black spot, powdery mildew, thrips, red spider and other diseases and insect pests. A variety of broad-spectrum fungicides should be applied to the disease every seven or eight days. For the insect pest, the pesticide with comprehensive effect of inhaling and contact killing should be selected. And frequently apply top dressing, more organic fertilizer. "Black and white ash" mixed with lime and plant ash is often applied to enhance the stress resistance of plants.
Fourth, timely "pruning and plastic surgery". Do not wait for the petals to fall before cutting, should be in its flowers will be cut before the end of time, so as not to consume nutrients. And the cutting place should be aimed at the leaf armpit, because there is a bud hidden between each leaf armpit. If you keep it, it will grow new branches and flowers soon. As for the position of pruning, it is better to cut off the leaf axils in the middle of the main branch. If the cutting is too low or too high, it is not ideal for the next flowering.
