Why do plants grow so fast after the rain? My peony didn't grow, but suddenly it grew 5CM.

Time and quality of watering flowers and trees

It is not enough to water flowers and trees, but to water them according to the changes of seasons and weather. In hot summer, watering around noon is the most taboo, because the soil temperature is high at this time, and the temperature difference with the water temperature is large. At this time, watering will suddenly reduce the soil temperature, and the roots of flowers and trees will be stimulated by low temperature, which will immediately hinder the normal absorption of water. So hot weather should be watered before 10 am or after 5 pm. On the contrary, in areas without frozen soil in winter, when flowers and trees cultivated in the open field need to be watered in winter, it should be done around noon. In spring and autumn, it is best to water after 10 a.m. and before 4 p.m.

The vast area north of the Yellow River Basin in China is cold in winter. Before the soil is frozen, the cultivated flowers and trees should be watered with "frozen water" to keep the soil moisture so that the flowers and trees can survive the winter safely. At the beginning of soil thawing in early spring, "turning green water" should be poured in time to promote the germination of flowers and trees.

What is the most suitable water for watering flowers and planting trees? It stands to reason that it is best to collect rainwater and snow water, especially rainwater during thunderstorms. Due to the electrochemical action of discharge, rainwater contains nitrogen that can be absorbed by plants. However, due to environmental pollution and acid rain, plants in frequent areas are seriously damaged, and rainwater and snow water in seriously polluted areas cannot be collected for watering flowers. Pond water with serious pollution and groundwater with high salt content are also not suitable for watering flowers. Household rice washing water, salt water and oil chili pepper water can't water the flowers. In general, it is convenient and safe to water flowers with tap water or drinkable well water.

Before watering the flowers with tap water or drinkable well water, water should be aired 1-2 days in advance. The advantage of this method is that chlorine in tap water volatilizes and the water temperature rises. Especially when watering indoor flowers and trees in winter, the water temperature should be consistent with the room temperature, so that flowers and trees will not be harmed. For example, azaleas are in full bloom during the Spring Festival, which increases the festive atmosphere of the festival. However, the root system of Rhododendron is slender and sensitive to the change of soil temperature. If you water it directly with tap water that has not been dried, it is easy to cause the leaves to fall.

Requirements of flowers and trees for soil pH value

Generally speaking, saline soil means that the soil contains high chloride ions and sodium ions; Alkaline soil means that the content of calcium ions and magnesium ions in soil is high and the content of hydrogen ions is low; Acidic soil contains high hydrogen ions and iron ions, but less calcium ions and magnesium ions. Most of the soils in northern China are neutral and alkaline, and some are saline-alkali soils. Most of the soils in southern China are neutral and slightly acidic, and some are strongly acidic. This has a great influence on the selection and cultivation of flowers and trees, but for potted flowers and trees, because there are various special flower cultivation substrates to choose from in the market, the variety selection of flowers and trees is not limited by the region.

In order to define the acidity and alkalinity of soil scientifically, the index (pH) of hydrogen ion content in soil is adopted internationally to express the acidity and alkalinity of soil. When pH =7, it is neutral soil with pH >；; 7 o'clock is the soil with alkaline pH value.

(1) Flowers and trees in acidic soil, such as camellia, rhododendron, Milan, jasmine, palm, Prynne, kumquat, osmanthus fragrans, Magnolia grandiflora, Podocarpus, cycad, Pinus pentaphylla, Alpinia, etc. All belong to acid soil flowers and trees. The suitable soil pH value is 5-6.

(2) Flowers and trees in neutral soil Most flowers can grow normally in weakly acidic to weakly alkaline soil. The suitable soil pH value is 6-8.

(3) Flowers and trees in alkaline soil can grow normally in high alkaline soil. For example, Tamarix, Lycium barbarum, Caragana, Mume, Berberis, Rosa davurica, Hibiscus, Sabina vulgaris, etc. Their tolerance to soil alkalinity is pH 7.5-9.

Rational fertilization of flowers and trees

Fertilization is a very important link in the process of flower cultivation and management. If you want to make your flowers flourish, colorful and fruitful, you must master scientific fertilization methods.

1. Fertilizing according to the growth period: before the plants germinate or at the early stage of leaf development, apply a fertilizer for accelerating germination, in which nitrogen fertilizer is the main one, supplemented by phosphorus and potassium fertilizer; Before flowering, plants should be fertilized to promote buds and flowers, and phosphate fertilizer is the main fertilizer in this period; Topdressing from flowering to fruiting stage, and applying compound fertilizer with complete nitrogen, phosphorus and potassium elements and trace elements at this stage; Apply base fertilizer during plant dormancy or overwintering period, which is mainly organic fertilizer, combined with soil improvement measures.

2. Fertilizing according to fertilizer characteristics: There are many special fertilizers for flowers in the market at present, so it is best to choose them for family flower cultivation, which is convenient and hygienic. Inorganic fertilizers include special fertilizers for flower viewing, fruit viewing and leaf viewing, as well as compound fertilizers. Organic fertilizer includes decomposed poultry fertilizer and unpolished bean cake, sesame sauce residue, horseshoe claw and so on. Fertilization should be selected according to different flower varieties and different growth stages. For example, compound fertilizer should be applied to ornamental woody plants during vegetative growth, special fertilizer should be applied to ornamental flowers in flowering period and special fertilizer should be applied to ornamental fruits in fruiting period. Woody plants with ornamental leaves should be applied with special fertilizer for ornamental leaves.

Third, fertilization according to the growth of flowers: different flowers need different soil environmental conditions. When the environmental conditions are very different, flowers will be weak if they don't adapt to growth. Fertilization should be based on growth potential. For the same variety, healthy plants can be fully fertilized according to the instructions for fertilizer use. For plants with weak growth, the application amount should be reduced as appropriate, and then gradually increased to normal application amount. Plants with weak growth potential have weak ability to absorb fertilizer, and too much use will backfire.

In a word, rational fertilization should follow the principle of balance of nutrient elements and combination of organic fertilizer and inorganic fertilizer, and be applied flexibly according to the types and growth conditions of flowers. At the same time, it should be noted that it is not suitable to apply fertilizer when the temperature is high around noon, let alone apply thick fertilizer, and apply base fertilizer when changing pots or transplanting flowers and trees.

Cultivation techniques of ginkgo biloba

Ginkgo biloba is also known as Ginkgo biloba, Gongsun Tree and Duck Foot Tree. Ginkgo biloba, a deciduous tree of Ginkgoaceae, blooms in April-May and matures in September-65438+10.

Ginkgo biloba has extensive adaptability to soil. Acidic soil, neutral soil, calcareous soil and moderately saline-alkali soil can all grow, and neutral soil and slightly acidic soil are the best. Drought resistance, water resistance.

Ginkgo biloba can be propagated by sowing, grafting, cutting and dividing plants. Usually it can be propagated by sowing or dividing plants. For the purpose of bearing fruit, it can be propagated by grafting. Transplanting and propagating, taking out pure seeds after the seeds mature in autumn, sowing in autumn of that year or storing in dry until the next spring, and accelerating germination with wet sand 1 month before sowing. Grafting propagation, commonly used methods are subcutaneous grafting, cutting grafting, branch grafting and split grafting. Generally speaking, the survival rate of cutting methods is low, but now the survival rate has been obviously improved by paying attention to cutting time and applying rooting hormone.

Spring buds can be transplanted before germination, which is easier to survive. After defoliation in autumn and before germination in early spring, it is necessary to apply organic fertilizer 1 times, which is beneficial to growth and fruiting. Ginkgo biloba is tree-shaped with a central trunk. After the seedlings are cultivated, they can be allowed to grow. With the increase of trunk, there are more and more side branches, forming a conical tree. In adulthood, the height of the tree does not increase, but the crown of the tree expands and the tree becomes round. In the young tree stage, there is generally no need to prune more, only the main branches at the top of the trunk are suppressed, and the tree vigor is slowed down by short cutting, so that the growth between the main branches is balanced. Too dense branches, pests and diseases and aging branches on the trunk should be cut off. Adult ginkgo trees have many short branches and few long branches, and the short branches are fruiting branches. At this time, just pay attention to cutting off competing branches, dead branches and drooping old branches. The main purpose of planting male plants in the garden is not to bear fruit, but to trim and control the tree shape.

Cultivation techniques of peony

Peony is a deciduous shrub of Paeonia in Ranunculaceae, and its height can reach 2 meters. The branches are many and thick, and the leaves are bipinnately compound. Peony cultivation in China began in the Southern and Northern Dynasties and flourished in the Tang Dynasty. Peony is one of the top ten famous flowers in China, and it is known as "the beauty of the country" and "the king of flowers". After long-term artificial cultivation, there are now more than 300 varieties.

Regarding the habit of peony, there is a saying that "it is appropriate to be cold and afraid of heat, like dryness and hate dampness, should be tall and sunny", which summarizes the biological characteristics of peony. But in fact, China's cultivation has been distributed in three climatic zones: warm temperate zone, middle temperate zone and central Asian fever. Peony likes loose and fertile loam or sandy loam with good ventilation, and avoids sticking heavy soil or low-lying land with accumulated water. The pH value of soil can be slightly acidic, neutral to slightly alkaline, indicating that peony has a wide adaptability in the long-term artificial cultivation process.

Taking the middle and lower reaches of the Yellow River as an example, the phenological period of the growth and development of ground-planted peony is roughly as follows: 1 budding from the middle and late month to the middle of February; From the end of February to the first half of March, the stems and leaves are pulled out and the buds are rapidly expanded; Flowering in April-May; From June to June, 65438+ 10 month, it entered the stage of flower bud differentiation; 65438+1late October-165438+1mid-October, leaves withered and went into dormancy.

Planting peony, whether planted in the ground or potted, must choose loose and fertile sandy loam. When planting peony in the ground, you should choose a place with high drought and good drainage, and pay more attention to whether the drainage is good when potted. Before planting, the roots should be trimmed properly, and the planting time is from late September to early June, with the Yellow River basin 10, earlier in the north of the Yellow River and later in the south of the Yangtze River. Peony is a fertilizer-loving plant. In order to make its flowers colorful and avoid blooming every other year, rational fertilization is one of the important conditions. Fertilize at least three times a year, that is, before flowering, after flowering and before and after winter. In addition to fertilization, we should also pay attention to shaping and pruning. The main tasks are stem fixing, pruning, bud removing and bud thinning.

When potted peony, we should also pay attention to the variety selection, that is, choose varieties with strong adaptability in early and middle flowering periods and good flower patterns, such as Luoyanghong, Er Qiao, Huhong, Zhao Fen, Lotus-shaped, Yipin Zhu Yi and Qinglong Womochi. If there are a large number of potted plants, you can dig a flower pond in winter, put sawdust in the pond, put the basin in the pond to keep out the cold, or bury it underground and wrap the upper part of the plant with straw.

If you want to make peony blossom on New Year's Day or Spring Festival, you can adopt the popularization method, that is, choose fine varieties of 4-5 years old, plant them in a greenhouse 35-60 days before the Spring Festival, and gradually raise the temperature, and control them at 20-25℃ during the day, 10- 15℃ at night, every 7-/kloc-0.