Hydrangea is fond of fertilizer. During its growing period, it usually applies fertilizer and water to the decayed thin cake every 15 days. In order to keep the soil acid, 1% - 3% ferrous sulfate can be added to the fertilizer solution for application. Regular irrigation of alum fertilizer and water can make the plant branches green; the application of 1-2 times of potassium dihydrogen phosphate in the bud stage can make the flowers bright and colorful; the application of cake fertilizer should avoid the rainy days, so as to avoid causing diseases, insect pests and damage to the root system.
Hydrangea has luxuriant branches and leaves, and needs more water. In the spring, summer and autumn of the growing season, sufficient water should be poured to keep the pot soil moist. In summer, the weather is hot and the evaporation is large. In addition to sufficient water, spray water to the leaves every day. Hydrangea should not accumulate water in the basin, or it will rot. After entering autumn, the amount of water should be reduced gradually.
Hydrangea like half shade and humid environment, not very cold resistant. In summer, do not direct sun, otherwise leaves are easy to scorch and yellow, branches and leaves are easy to wilt and wither after frost, part of the cultivated ground in the open field withers and dies in winter, and the next year, sprout new shoots from the rhizome and then bloom, such as in the greenhouse potted winter, can keep evergreen.
Spring maintenance points: potted should prune the dead branches and turn the pot to change the soil. After taking the pot, you can apply one or two times of thin liquid fertilizer based on nitrogen fertilizer, which can promote the germination of branches and leaves.
Key points of maintenance in summer and Autumn: it should be placed in the semi shade or under the shade to prevent direct sun exposure and yellow and scorching leaves. Before and after anthesis, apply fertilizer once or twice to promote the growth of green leaves and flowers. After the flower withers, the pedicel should be repaired in time to keep the posture beautiful. Basin soil often keep wet, but want to prevent water accumulation after rain, in order to prevent Hydrangea's fleshy root from rotting because of too much water.
Key points of winter maintenance: after winter, the plants planted in the open field shall be heaped with soil to keep warm, so as to make them live through the winter safely; the potted plants can be placed in a warm place facing south and facing the sun without cold wind. Although the withered leaves fall off in winter, the roots and branches still survive, and new leaves sprout in the next spring.
Potted Hydrangea, generally once a year to turn basin for soil. It is better to change basin and soil in the first ten days of March. When changing the basin, the root system of the plant should be pruned, and the rotten root, rotten root and excessively long root whisker should be cut off. After the plant is moved to a new basin, the soil should be compacted, and then watered, placed in the shade for about 10 days, and then moved outside for normal management.
To make the crown of potted Hydrangea more beautiful and flowering, it is necessary to prune the plants. Generally, when the seedlings are 10-15cm high, they can be removed to make the lower axillary buds germinate. Then select 4 new shoots in the middle and upper part, and remove all the axillary buds in the lower part. When the new branches are 8-10 cm long, the second coring should be carried out. Hydrangea usually blooms on the two-year-old strong branch. After flowering, the old branch should be cut short and 2-3 buds should be kept, so as to limit the growth of plants and promote the growth of new shoots. After autumn, cut off the top of the new shoots, so that the branches stop growing, so as to survive the winter. After such pruning, the plant type is more beautiful, greatly enhancing the ornamental value.
