What causes grapevines not to bear fruit?
Grapes are a common fruit we all know and are deeply loved by people. Some people often plant a few vines in their own courtyard, but many report that the grapevines they planted have never borne fruit. What causes this? And what should be done about it? We have summarized some experience for you, let's take a look.
I. Reasons for not bearing fruit
1. Variety reasons
Some friends may have been cheated by the seller when buying seedlings and bought extremely poor-quality young plants. No matter how diligently you manage them after planting, such seedlings will not bear fruit.
2. The time has not yet come
Grapes have their own time to bear fruit. Some seedlings are quite young when purchased, only 1-2 years old, so no matter how well they are planted and managed, they will not bear fruit that quickly. When their fruiting time arrives, they will naturally bear fruit.
3. Insufficient fertilizer
When growing grapes, fertilizer is crucial. Apply sufficient base fertilizer, and in summer and autumn, fertilizer must be applied continuously as a top dressing to accumulate nutrients for the following year, so that in the following spring more branches and leaves can sprout.
4. Unfavorable growing environment
When growing grapes at home, sunlight and ventilation are relatively important. If they grow in an environment with insufficient light and poor ventilation, the fruit they produce will decrease year by year until they bear no fruit at all.
5. Pruning
Prune once before flower bud differentiation in spring, and apply a top dressing once at bud break. Choose organic fertilizer for the top dressing, as it can provide the plant with sufficient nutrients, enabling it to sprout more young buds and laying the foundation for a high yield.
II. Solutions
1. Management during the growing period
After flower bud differentiation, if there are too many young buds, remove an appropriate amount of buds, removing some excessive and unnecessary buds as early as possible, which can reduce the plant's nutrient consumption. When new shoots grow to 15-30 cm, tie them promptly, and at the same time remove the tendrils; also do proper pinching, removing all secondary shoots below the fruit cluster, and pinching secondary shoots above the fruit cluster while leaving 2 leaves. After flowering, do proper thinning of flower clusters and fruit; keep only one well-growing flower cluster on each fruiting branch, and thin out the rest.
2. Fertilizer and water management
To achieve a high grape yield, fertilization is indispensable. According to research, for every 100 kg of grapes produced, 0.75 kg of pure nitrogen, 0.75 kg of phosphorus, and 0.63 kg of potassium are consumed. Therefore, apply base fertilizer after fruit harvest and before new shoots mature; generally apply quick-acting fertilizer 10-15 days during the flowering period, and in July during the fruit development period it is advisable to apply base fertilizer, which has an obvious effect on weeds. Spraying low-concentration borax solution and superphosphate solution during the flowering and fruiting period can increase the fruit-setting rate and yield. Before flowering, keep the soil moist to provide favorable conditions for flowering and fruit setting, but do not water during the flowering period. After fruit setting, the fruit needs a large amount of water, so at this time water every 7-10 days according to climate changes, but do not water during the fruit coloring period to avoid reducing sweetness.
The above is an introduction to what causes grapevines not to bear fruit, and we hope it helps you. To learn more related knowledge, please stay tuned to us.