two。 Can be used as rootstock to graft other plants.

Leaf cactus is a primitive cactus plant, crab claw orchid arrow lotus and cactus ball can be grafted. Because of its strong cold resistance, developed root system and exuberant growth, it can often be used as rootstock for tree peony, mountain blowing and so on. However, because the stem is too thin, it is only suitable for grafting balls with small diameter. Grafting can improve the ornamental quality of plants and sublimate the value of leaf cactus.

This is also the outstanding advantage of leaf cactus.

How does the rootstock of grafted crab claw orchid wilt? How does the rootstock of grafted crab claw orchid wilt?

How to wilt the rootstock of grafted crab claw orchid? the cactus, which is used as the rootstock of grafted crab claw orchid, often wilts in hot summer, which is caused by the special weather conditions in summer. Although cacti can withstand extremely high temperatures of 40 ℃, although they are very hot and dry during the day in their African origin, they are cooler at night, so they have little effect on plants.

However, in most parts of China, most cacti can not stand the hot and muggy weather, especially in the case of poor ventilation, when the temperature reaches 30: 35 ℃, the growth rate of most varieties slows down, such as more than 38 ℃, and the night temperature is also very high, then potted cactus plants are forced to go into dormancy, that is, the so-called summer dormancy. Only when it is cool in autumn can it return to normal growth.

Therefore, the crab claw orchid plants grafted with cactus as rootstock generally grow well in spring and autumn in most parts of China, and are often "half dead" in hot and muggy summer. If too much water or too much Rain Water is watered at this stage, or some fertilizer is applied, it will inevitably lead to the rotten root of the cactus, resulting in the wilting of the cactus day by day.

For wilting plants, they can be shelved in a cool and ventilated place, or transferred to an air-conditioned room with better ventilation conditions, and watered to an appropriate amount of water spraying to create a relatively cool small environment, which is expected to recover in September. After entering the summer next year, the cactus grafted and bred with cactus as rootstock should be moved to a ventilated and cool half-shade place as soon as possible to spend the summer, controlled watering and stopping fertilization, so that it can get through the hot summer smoothly and give normal water and fertilizer management when it is cool in autumn. only in this way can the cactus grafted with cactus as rootstock produce large, colorful flowers.

There are many species of cactus grafted cactus plants, some of which are like woody plants and some of which have herbaceous plant habits, but all cactus plants are perennial and belong to dicotyledonous subclass. therefore, the vascular bundles in the stem can produce a cambium and arrange in a ring, so that the stem of the cactus continues to increase due to the meristematic ability of the cambium. The cambium is also the meristem in the vascular bundle. It is precisely because of the cambium tissue in the vascular bundles in the stem that cactus plants can easily propagate by grafting like fruit trees and other ornamental trees. There are many morphological changes in the stem of cactus, such as tall tree type, dense shrub type, vine-like thin stem, creeping overhanging branch, flat leafy stem and small solitary globule. In different forms of stem, the position of vascular bundle is also different. Grafting operator must. It is necessary to have a clear understanding of the distribution of vascular bundles, otherwise it is difficult to meet the requirements of close combination of vascular bundles of scions and rootstocks. When the stem of cactus was dissected and observed, compared with the soft cells of the peripheral cortex, the tissue of the vascular bundle was denser and darker, showing bright green, and the pith in the cortex and the vascular ring of the stele were light and even white. To sum up, cactus plants according to the general shape of their stems, the distribution of their internal vascular bundles are mainly in the following forms. First, the leaf cactus is the most primitive type of cactus, and its shape and vascular bundle in its stem are the same as those of ordinary shrubs or small trees. It is morphologically different from other cactus plants in that its stems have not yet become very fleshy and still have leaves, but generally woody plants have common axillary buds in the axils of leaves (although in some cases they become hidden buds). On the other hand, there are thorns in the axils of leaf cacti. Most cactus plants only preserve the thorn seat after the succulent stem and degenerated leaves. The thorn can be said to be the "bud" of the cactus plant. But the structure is different from the bud of the general plant, it is the unique characteristic of the cactus plant. The most typical example of this type is the common cactus in cultivation, which can be said to be a kind of abnormal stem that has been shortened and flattened. When the cactus is born, the flat fleshy stem nodes have short degenerated fleshy leaves, but they soon fall off, while spines are left in the axils of the leaves, with bristles and spines. Both branches and flowers come from the thorn. From the section of the cactus, we can see the general evolution of the vascular bundles of the stele and the branches leading to the thorn seat from the leaf cactus. Type of columnar stem although some of the columnar stems are tens of centimeters in diameter and some are less than one centimeter in diameter, the distribution of vascular bundles in the stem is more or less the same. The branches of vascular bundles leading to the thorn seat are often affected by the shape and number of ribs or wings in the columnar stem. Fourth, globular stem (including cylindrical stem) type globular stem can be understood as shortening and fattening columnar stem. The columnar vascular bundles also vary with the shape of the stem. Some globular stems still have ribs, and the ribs of many globular stems are further divided and evolved into verrucoma, and their vascular bundle branches change to the thorn seat. Fifth, flat leafy stem type flat abnormal stems have many nodes, the most common are epiphyllum, arrow lotus, crab claws, fairy branches and so on. This type of stele vascular bundle is located in the central part of the flat stem, because the stem is thin, its position can be seen from the outside, if the backlight, sometimes you can see the shadow of the vascular bundle branch leading to the thorn seat position. In addition, many cactus plants have deformities on the basis of already abnormal stems, which are common in cultivation, such as rocky deformities are used neither as rootstocks nor as scions for propagation, often growing from their own roots. The coronal malformed stem of chicken is often used for grafting propagation of scion. Due to external deformities and irregularities, the form of the internal stele vascular bundle is also difficult to shape, and the vascular bundle branches leading to the thorn seat also move from the irregular stele vascular bundle to the indefinite spinous pedestal. It is also important to add that there is a third stage in the succulent stem of cactus in addition to the vascular bundles of the stele and the vascular bundles leading to the thorn seat. However, these network vascular bundles mainly play a small part of the role of transport, generally not the main object of use in grafting. Sometimes the grafters do not see or do not know how to use vascular bundles to ensure survival. During grafting, the vascular bundles of the scions do not come into contact with the vascular bundles of the stele of the rootstock or the vascular bundles leading to the thorn seat, but occasionally they survive. Obviously, it happened to be a thin network of vascular bundles at work. This happens, but not often, and network vascular bundles are unreliable in grafting. The schematic diagram only takes the longitudinal analysis of a cactus as an example, and other types of stems have this network of vascular bundles inside. Several aspects that B should pay attention to through the above introduction, we can have a basic understanding of the vascular bundles in the stems of most cactus plants. However, in order to maintain the stability and ensure the quality in the grafting operation, it is suggested that beginners should find some common cactus plants to do several anatomical experiments according to the above contents and diagrams. When dissecting, do not rush to cut the stem from the center, preferably step by step, layer by layer. Through careful dissection, we should not only find the exact location of the vascular bundle, but also further connect with the direction of the branches of the main vascular bundles. This is very important in lateral grafting, when the graft knows the position of the rootstock and the vascular beads in the scion, and has a clear idea of how to cut the knife. In order to achieve stable and accurate cutting, smooth knife edge, so as to ensure the quality of grafting. Grafting propagation or grafting cultivation, the most fundamental is through the grafting technique to combine the scion and rootstock into a new individual. In the actual operation, it is inevitable that there will be differences in stem shape, body size and seedling age. If you encounter this situation, how to adapt to grafting, please pay attention to the following points: first, grafting cutting should make use of the main vascular bundles as much as possible. The main cutting object is the use of vascular bundles in the stem.) In most cases, the scion is always grafted with the vascular bundles of the central column, while the rootstocks sometimes use the vascular bundles leading to the thorn seat to branch. 2. The cutting part should be the best and most suitable part during grafting and cutting. It goes without saying that the main vascular bundles must be found purposefully, but even if the vascular bundles can be found, there are still requirements for where they are best. Putting aside the problem of plant posture after graft survival, there is also a question of whether the selection site is appropriate or not only in terms of the tissue characters of the rootstock and scion itself. Taking the spherical stem as the rootstock as an example, the tissue near the upper part is tender, the diameter of the vascular bundle ring is smaller, and it is convenient to cut. The top of the spherical stem must be cut off when cutting, otherwise it cannot be grafted. On the other hand, the part closest to the top of the bulbous stem, that is, the place with a slightly concave appearance and fresh color is the part of the stem growing point, although the meristematic ability of the growing point is the strongest, but its function is to make the stem lengthen longitudinally. Here the vascular bundle annular tissue has not yet been formed, and if the scion is affixed here, the stem will often elongate upward because of the growing point, and it is difficult for the scion to heal with the rootstock to affect the graft survival. The better cutting position should be moved down from the top of the stem below the growing point. The vascular bundle of the stele can be seen with the naked eye as a bright green ring. The diameter of the vascular bundle ring in the middle column of the spherical stem gradually decreased with the thickening of the stem, until after the thickest part in the middle, and then moved downward, the diameter of the vascular bundle ring gradually decreased with the decrease of the stem. At the same time, with the lower part of the stem, the harder the outer skin, the older the tissue in the vascular bundle ring of the stele, and the stronger the Lignification components. Therefore, the cutting position is preferably above the maximum diameter and below the growth point. The diameter of the vascular bundle ring in the stem of the cactus with columnar stem changes little, but the tissue is more and more aging, so it is best to cut in the upper part of the stem, but also to avoid the growing point. The scions used in grafting propagation are generally stem bodies with tender tissue, and the cutting parts are usually in the middle and lower parts. Sometimes, growers want seedlings to grow rapidly, or because seedlings do not have chlorophyll, grafting is often used to make them continue to grow. at this time, rootstocks often use tender triangular columns, and the cutting part should be just below the growth point; when cutting the scion of real seedlings, it should be lifted by roots and cut slightly at the base of the stem, the incision should be small, so as not to affect its survival. Third, cutting should be combined with stem morphology and grafting methods of scion and rootstock, such as globular stem, flat stem and leaf cactus stem. On the other hand, it is also worth paying attention to whether the size of the scion rootstock matches or not and how to adjust the cutting position. When determining the cutting site after determining the appropriate grafting method, the convenient management and beautiful posture of the whole plant after graft survival should also be taken into account. 4. after the vascular bundles of scions and rootstocks should be correctly cut, it is very important that the vascular bundles of scions and rootstocks should be correctly grafted. Take flat grafting as an example, the scion is well connected to the center line of the rootstock, but sometimes it does not survive. On the contrary, the scion is placed slightly on the contrary, which is clear at a glance as shown in the following diagram. Sometimes the diameter of the vascular bundle ring of the scion and the rootstock is equal, which makes the two-dimensional vascular ring completely coincident, which heals fastest and grows well after survival. However, the situation often encountered by the grafting is that the diameter of the vascular bundle ring of the scion is different from that of the rootstock (usually the diameter of the vascular bundle ring of the scion is small). In this case, there are several possibilities, among which the scion rootstock is well positioned, and the two vascular bundle rings happen to be in the form of concentric circles, and grafting fails. Only when the two vascular bundle rings have two points in contact is the most sure. How other types of stems and grafting methods make the correct placement of scions and rootstocks is more or less the same as the above situation, grafting beginners can draw an example. In short, cactus plant grafting technology is difficult to say, not difficult to say is not difficult. We should mainly master science, observe carefully, practice more, know well, operate carefully and manage carefully, so as to achieve the effect of high survival rate and good quality of grafting cultivation (transferred from Shouguang Lao Zhang)