1. In the growth period of hydrangea, pruning after flowering is also necessary, but pruning hydrangea is generally carried out after flowering. Because the flower bud differentiation period of hydrangea is from September to 65438+ 10, and the flowers of hydrangea will be in the branches. If pruning is carried out in winter or spring, the bud of hydrangea will be cut off, resulting in hydrangea not blooming that year. Therefore, attention should be paid to the pruning of hydrangea.
Pruning method: We prune the hydrangea, mainly after the hydrangea blooms. We can cut the branches of hydrangea short after it blooms. If the branches of hydrangea are short, we can subtract two pairs of leaves under the bulb, and then hydrangea will grow new side branches. If it is endless summer, that year will still bloom.
If the branches of hydrangea are long, we can leave two or three pairs of leaves on the branches after the hydrangea blooms, and cut off all the upper ones, so that the lateral branches of hydrangea will be shorter and the plant type of hydrangea will be shorter. Otherwise, hydrangea branches are too long, which is easy to cause nutrient loss. Secondly, after the hydrangea blooms, it is easy to bend the branches because of the large bulb, and the hydrangea is easy to fall to the ground and needs more pruning.
2. Fertilization is more fattening after hydrangea pruning. After pruning, local fertilization is needed to make the hydrangea grow new lateral branches, and then good flower bud differentiation will be carried out from September to 10. So how do we fertilize hydrangeas?
Fertilization management: after the hydrangea is pruned, we can apply a thin decomposed cake fertilizer to the hydrangea every 15~20 days, which can promote the hydrangea to grow more side branches. You can also use the same proportion of nitrogen, phosphorus and potassium ternary fertilizer to make the hydrangea grow vigorously and grow new buds.
Hydrangeas grow slowly in hot summer. In the meantime, it is necessary to stop fertilization to prevent the fertilizer from burning its roots. After hydrangea grows vigorously in autumn, using thin and decomposed cake fertilizer can promote flower bud differentiation.
3. Water the hydrangea after the soil is dry. They like humid environment, especially afraid of drought and water accumulation, so they need to pay attention when watering hydrangeas.
Watering management: We can water hydrangeas with rainwater, especially in the north. If we use tap water, we need to leave it for more than 24 hours. Or pouring 0.2% ferrous sulfate water-soluble fertilizer every 15~30 days can prevent iron deficiency and yellow leaves.
Also, when watering the hydrangea, you can keep the soil moist, but don't accumulate water. Generally, we can water it again after the soil turns white, otherwise the hydrangea will easily fade in front of you.
4, afraid of bright light hydrangea likes bright, not too bright environment, if the light is too strong, it is easy to sunburn the leaves, so we need to pay attention to raising hydrangea.
Lighting suggestion: When we raise hydrangeas, we can properly accept the sunshine when the sunshine is not strong. When the sun is strong, we need to raise them in a bright and well-ventilated environment, especially in hot summer, otherwise hydrangeas are prone to diseases and insect pests, or their leaves are sunburned.
After the hydrangea blooms, as long as the above four points are achieved, the hydrangea plant will become short and strong, and it will open into a big ball in the coming year.