Analysis of the Reasons for the Stunted Growth of Rose of Sharon
The editor introduces you to some knowledge about roses and the analysis of the reasons for the stunted growth of rose of Sharon. Please see the detailed introduction below.
Plant stunted growth: Refers to the phenomenon where the growth of the plant's vegetative organs, roots, stems, and leaves, stops. It is common to encounter stunted growth when transplanting rose seedlings, especially during the hot summer. Although it would be more appropriate to discuss this topic in the spring, I will take this opportunity to share my thoughts and views. Welcome to comment and correct!
1. Stunted growth of rose seedlings transplanted in early spring and winter: At this time, the temperature in most areas is low, usually below 5 degrees Celsius during the day. The roses are in a dormant period and in a state of growth arrest, which is a normal physiological phenomenon, known as "pseudo-stunted growth." Additionally, during the high-temperature period of summer, when the daily temperature exceeds 33 degrees and the air humidity is low, the roses are semi-dormant and almost do not grow. The respiratory function is greater than the photosynthesis, and it is not suitable to transplant flower seedlings at this time unless the temperature and humidity are artificially controlled, otherwise, the seedlings may fail to adapt and the plants may die.
2. Stunted growth under normal growing conditions:
2.1 Surface stunted growth. Young seedlings have weak root systems and must re-develop roots after transplanting to absorb more nutrients for the growth and development of the plants. Therefore, there is no visible growth of stems and leaves on the surface. This situation is often seen during the transplanting process of toothpick seedlings and needle tip seedlings. You must be patient and wait, it may take three months to improve, depending on the vitality of the variety, the time may vary. This process is the root recovery and development process, sometimes referred to as "pseudo-stunted growth."
2.2 Soil difference stunted growth. The potting soil used for container gardening differs too much from the original potting soil of the young seedlings, causing stunted growth. The soil used in nutrient pots is usually loose and breathable, and contains slow-release granular fertilizer. However, the soil used by gardening enthusiasts is varied and difficult to integrate with the original soil, which can lead to the phenomenon of original soil surrounding the roots, i.e., the roots do not grow into the transplanting soil but remain confined to the original soil, resulting in almost no growth of stems and leaves after transplanting. Attention should be paid to the physical properties of the potting soil, trying to keep it close to the original soil properties of the nursery, and during transplanting, carefully remove the top layer of the original soil (without damaging the roots), exposing some roots to allow them to fully contact with the new soil and provide a new environment for root growth outward.
2.3 Bare-root seedling stunted growth. Many bare-root seedlings from nurseries are wrapped with mud or garden soil, and the protective soil around the roots is compacted to keep them moist and protected during packaging. If transplanted as is, the roots may be obstructed and the seedlings may wither and die. The roots should be washed or the soil clumps broken, old roots appropriately cut, and then transplanted into new soil and pots.
2.4 False active stunted growth due to missing the transplanting season. This usually happens after spring, when the seedlings' buds have already germinated after being delivered by快递. However, the roots have not yet recovered after transplanting. Under suitable temperature and humidity conditions, the buds grow rapidly, using up the plant's moisture and nutrients, leading to growth arrest and then withering. If the plant does not receive timely water supplementation, it will quickly wither and die. Therefore, it is important to master the timing of transplanting and avoid buying seedlings and transplanting them out of season. Remove any germinated buds early on, leaving only dormant ones; if the seedlings have long stems, you can cut the plant shorter to stop the development of stems and leaves, allowing it to wait for the germination of bamboo shoots or low buds; if the seedlings have many compound leaves, you can dilute leaf fertilizer and spray it on the leaves, taking root external fertilization measures to provide the plant with moisture and nutrients, extending the period of vegetative growth. Pay attention to keeping the concentration thin and choose the morning for spraying. To supplement moisture in time, you can spray clean water twice a day on non-rainy days, continuously, until new buds germinate and leaves develop normally. By then, the root development has also caught up with the growth rhythm.
2.5 Stunted growth after removing flower buds from medium and small seedlings. Generally, the initial flower buds are cut after transplanting. At this time, the plant's hormone signals are for reproductive growth, and no nutritional growth of roots, stems, and leaves will start until these signals are completely terminated, which varies in length depending on the variety. Countermeasures: Use artificial growth hormones to intervene and terminate the reproductive growth process, which is not suitable for amateur gardeners and is not recommended; improve the growth environment and the distribution of ion types in the soil, such as increasing the amount and frequency of watering, spraying to increase air humidity, reducing light intensity, applying fast-acting nitrogen fertilizer, pinching branches to promote side buds, cutting the top 5 leaves of branches, etc., to quickly start the plant's nutritional growth mechanism.
3. Stunted growth caused by diseases and pests: It is easy to understand that diseases and pests can cause physiological function and processes of the plant to become disordered, blocking the supply of nutrients and the development of the roots, leading to stunted growth, and in severe cases, plant death. You must take appropriate treatment measures for the rose seedlings, eradicate diseases and pests, re-grow seedlings, then apply fertilizer slowly, water less, spray more (with enough leaves), cool in the shade, avoid direct sunlight, and carefully care for the plants. Once the plants recover their vitality, they will naturally rejuvenate and display their beauty.
The above analysis of the reasons for the stunted growth of rose of Sharon is provided for everyone's learning and understanding.