Why does the yardlong bean only grow vines and not flower?

The yardlong bean is a common legume vegetable that sets pods in summer. In the south, planting begins in spring. Almost every farming household grows some, and some people plant a certain scale at night to sell. But the most common problem when growing yardlong beans is that they only grow vines and simply will not flower. Without flowers there can be no pods, no yield, or only a low yield. So why does this happen, and how should you prevent, regulate and improve this situation? Let's take a look now!

1. Causes

Water and fertilizer nutrients are too abundant, causing the plant's vines to grow wildly and become leggy, so it does not enter reproductive growth and stays in the vegetative growth stage, and therefore cannot flower; planting in the open field too early, when the temperature is relatively low or a sudden late spring cold snap occurs, will inhibit growth, and likewise planting too late, when the flowering period meets high temperatures, may also prevent flowering; using too much nitrogen fertilizer, when more phosphorus fertilizer should be applied, and spraying some growth regulators, such as Youma Leiguobao; or insufficient nutrients and water, with the planting soil too poor, so the plant has no nutrients to support flowering. It is also possible that pests appeared early on and too much pesticide was used, causing phytotoxicity, so it cannot flower.

2. Prevention and improvement

1. Fertilizing

Fertilize during early growth, but do not use too much; enough for normal growth is fine. If you see leggy growth, pinch off the growing tips when you should, thin out some branches, and do not keep too many extending stems.

2. Temperature

Choose the right time for sowing. You can only start sowing when temperatures are above 12°C, the temperature at emergence is best above 15°C, and during growth the temperature is best between 18 and 28°C. Above 35°C growth is slow, and below 5°C growth stops. So when sowing, also roughly calculate what environment each stage will be in, and keep it as suitable as possible.

3. Nutrition

Pay attention to nutrition in the early growth stage. Choosing fertile soil with high organic matter for planting gives good nutrition. If the soil conditions are not there, find a way to improve the planting field, for example by digging out the original soil and using humus soil, mixing in river sand, peat and the like to prepare nutrient soil for planting. Spray Youma Leiguobao to regulate the hormone balance in the plant and help it flower.

4. Less pesticide

When preventing pests, pay attention: for whatever can be trapped and killed or caught by hand, try not to use pesticide. If using pesticide, you can use new types with mild phytotoxicity. Try not to use emulsifiable concentrates, which cause relatively greater pollution, or do not use contact insecticides, which are easily absorbed by plants.

When yardlong beans do not flower, it is not necessarily too much fertilizer or too much nitrogen fertilizer applied early on, or insufficient nutrition; or it may be the direct effect of temperature. In addition, pesticide may have caused phytotoxicity. In fact, there may also be some other causes. In actual production, you should also accumulate more experience.